Form 8-K - Current report

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

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FORM 8-K

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CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (date of earliest event reported): January 29, 2025

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FIRST INTERSTATE BANCSYSTEM, INC.

(Exact name of registrant as specified in its charter)

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Delaware

001-34653

81-0331430

(State or other jurisdiction of
incorporation or organization)

(Commission
File No.)

(IRS Employer
Identification No.)

401 North 31st Street

Billings,

59101

(Address of principal executive offices)

(zip code)


	(406)	255-5311
(Registrant’s telephone number, including area code)

	Not Applicable
(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a- 12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

* * * * *

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of exchange on which registered
Common stock, $0.00001 par value	FIBK	NASDAQ

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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Item 2.02 Results of Operations and Financial Condition.

On January 29, 2025, First Interstate BancSystem, Inc. (the “Company”) issued a press release regarding its financial results for the quarter ended December 31, 2024. A copy of the press release is furnished herewith as Exhibit 99.1 and is incorporated by reference herein. Neither the information included or incorporated by reference under this Item 2.02, nor the press release furnished herewith, shall be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”) or incorporated by reference into any registration statement or other document filed pursuant to the Securities Act of 1933 (the “Securities Act”) or the Exchange Act, except as expressly set forth by specific reference in such filing.

Item 7.01 Regulation FD Disclosure.

On January 29, 2025, the Company posted a new corporate presentation (the “Presentation”) on the Events & Presentations page of the Company’s website at https://www.fibk.com. The Presentation, which is furnished with this Current Report as Exhibit 99.2 and incorporated herein by reference, updates previously furnished presentations and provides an overview of the Company and its operations. Neither the information included or incorporated by reference under this Item 7.01, nor the Presentation furnished herewith, shall be deemed to be “filed” for purposes of Section 18 of the Exchange Act or incorporated by reference into any filing under the Securities Act or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Item 8.01 Other Events.

On January 29, 2025, the Company also announced that the Board of Directors of the Company declared, on January 28, 2025, a dividend of $0.47 per share, that is payable February 20, 2025 to shareholders of record of the Company as of February 10, 2025.

Item 9.01 Financial Statements and Exhibits.


(d)	Exhibit Number	Description

	99.1	Press Release dated January 29, 2025.

	99.2	Presentation

	104	Cover Page Interactive Data File (embedded within Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities and Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: January 29, 2025



			FIRST INTERSTATE BANCSYSTEM, INC.

			By:			/s/ JAMES A. REUTER
						James A. Reuter
						President and Chief Executive Officer

Exhibit 99.1

For Immediate Release

First Interstate BancSystem, Inc. Reports Fourth Quarter Earnings

Billings, MT - January 29, 2025 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the fourth quarter of 2024. For the quarter, the Company reported net income of $52.1 million, or $0.50 per diluted share, which compares to net income of $55.5 million, or $0.54 per diluted share, for the third quarter of 2024 and net income of $61.5 million, or $0.59 per diluted share, for the fourth quarter of 2023.

For the year ended December 31, 2024, the Company reported net income of $226.0 million, or $2.19 per diluted share, compared to $257.5 million, or $2.48 per diluted share, for the year ended December 31, 2023.

HIGHLIGHTS

•We are pleased to announce the appointment of James A. Reuter as the Company’s President and Chief Executive Officer, effective November 1, 2024.

•Net interest margin increased to 3.18% for the fourth quarter of 2024, a 17-basis point increase from the third quarter of 2024. Net interest margin, on a fully taxable equivalent (“FTE”) basis1, increased to 3.20% for the fourth quarter of 2024, or a 16-basis point increase from the third quarter of 2024.

•Non-performing assets decreased $33.3 million, or 18.6%, to $145.6 million as of December 31, 2024, from $178.9 million as of September 30, 2024 and increased $17.8 million, or 13.9%, from $127.8 million as of December 31, 2023.

•Criticized loans increased $170.0 million to $773.3 million as of December 31, 2024, compared to $603.3 million as of September 30, 2024, driven mostly by downgrades in the commercial real estate loan portfolio, and increased $85.0 million, compared to $688.3 million as of December 31, 2023.

•For the fourth quarter of 2024 net charge-offs of $55.2 million or 1.22 basis points of average loans included a commercial and industrial loan for $49.3 million. Net charge-offs within the remaining portfolio totaled $5.9 million or 0.13% of average loans.

•Other borrowed funds decreased $512.5 million, or 24.6%, to $1,567.5 million as of December 31, 2024, from $2,080.0 million as of September 30, 2024 and decreased $1,035.5 million from December 31, 2023. The decreases are primarily the result of the Company’s pay-off of the $1.0 billion Bank Term Funding Program borrowing in December 2024 using a combination of excess cash and lower-rate FHLB advances after the fed funds rate cut in December 2024.

•Total deposits increased by $151.5 million at December 31, 2024 from September 30, 2024, with interest-bearing demand deposits increasing by $233.8 million and non-interest bearing deposits decreasing by $121.4 million.

•Non-interest expense increased $1.5 million for the fourth quarter of 2024, compared to the third quarter of 2024 and decreased $5.1 million compared to the fourth quarter of 2023. The third quarter of 2024 non-interest expense included $3.8 million related to the transition of the Company’s President and Chief Executive Officer; excluding the former CEO severance expenses, non-interest expense increased $5.3 million compared to the third quarter of 2024, primarily due to an increase in professional services, short-term incentive accruals, health insurance costs, and occupancy costs.

•Efficiency ratio of 60.2% for the fourth quarter of 2024 compared to 61.8% for the third quarter of 2024.

•Capital ratios continued to improve during the fourth quarter of 2024, with common equity tier 1 capital ratio increasing 0.30% to 12.16%, compared to the third quarter of 2024.

1 Represents a Non-GAAP financial measure. See Non-GAAP Financial Measures included below for a reconciliation to this measure’s most directly comparable GAAP financial measure.

“We are pleased to see continued improvement in our core operating metrics. Net interest margin expanded for the third consecutive quarter, and the net interest margin, excluding purchase accounting, exceeded 3% in the fourth quarter. Growth in deposits exceeded our expectations and we were able to take advantage of the flexibility of our BTFP borrowings to reduce our funding costs. Charge-offs were elevated this quarter, driven by a previously reported, non-performing commercial and industrial loan. The team working this loan did well adhering to agreed upon resolution options, finding the best available outcome, and allowing us to move forward,” said James A. Reuter, President and Chief Executive Officer of First Interstate BancSystem, Inc. “As I approach the 90-day mark since I joined First Interstate, I have had the opportunity to visit many of our markets and am impressed to see a strong, client-centric, community Bank. I look forward to working with the team at First Interstate to build upon the core strengths of this institution and, ultimately, to drive long-term shareholder value.”

DIVIDEND DECLARATION

On January 28, 2025, the Company’s board of directors declared a dividend of $0.47 per common share, payable on February 20, 2025, to common stockholders of record as of February 10, 2025. The dividend equates to a 5.8% annualized yield based on the $32.53 per share average closing price of the Company’s common stock as reported on NASDAQ during the fourth quarter of 2024.

NET INTEREST INCOME

Net interest income increased $8.8 million, or 4.3%, to $214.3 million, during the fourth quarter of 2024, compared to net interest income of $205.5 million during the third quarter of 2024, primarily due to a decrease in interest expense resulting from a decrease in average debt balances and purchase accounting accretion and interest recoveries attributable to non-accrual loan paydowns. Net interest income increased $6.5 million, or 3.1%, during the fourth quarter of 2024 compared to the fourth quarter of 2023, primarily due to an increase in interest and fees on loans and interest bearing deposits, and a decrease in interest expense resulting from decreased rates on borrowings along with a decrease in average debt balances, partially offset by lower interest income on investment securities as a result of a decrease in average investment security balances in the fourth quarter of 2024.

•Interest accretion attributable to the fair valuation of acquired loans from acquisitions contributed to net interest income during the fourth quarter of 2024, the third quarter of 2024, and the fourth quarter of 2023, in the amounts of $8.6 million, $4.4 million, and $5.4 million, respectively.

The net interest margin ratio was 3.18% for the fourth quarter of 2024, compared to 3.01% during the third quarter of 2024, and 2.99% during the fourth quarter of 2023. The net FTE interest margin ratio2 was 3.20% for the fourth quarter of 2024, compared to 3.04% during the third quarter of 2024, and 3.01% during the fourth quarter of 2023. Excluding interest accretion from the fair value of acquired loans, on a quarter-over-quarter basis, the adjusted net interest margin ratio (FTE)2, was 3.08%, an increase of 11 basis points from the prior quarter, primarily driven by lower interest expense resulting from decreased borrowings. Excluding interest accretion from the fair value of acquired loans, on a year-over-year basis, the adjusted net interest margin ratio (FTE) increased 14 basis points, primarily as a result of lower interest expense resulting from decreased rates on borrowings and a favorable change in the mix of earning assets.

PROVISION FOR CREDIT LOSSES

During the fourth quarter of 2024, the Company recorded a provision for credit losses of $33.7 million. This compares to a provision for credit losses of $19.8 million and $5.4 million during the third quarter of 2024 and during the fourth quarter of 2023, respectively.

For the fourth quarter of 2024, net charge-offs were $55.2 million, or an annualized 1.22% of average loans outstanding, compared to net charge-offs of $27.4 million, or an annualized 0.60% of average loans outstanding, for the third quarter of 2024 and net charge-offs of $4.8 million, or an annualized 0.10% of average loans outstanding, for the fourth quarter of 2023. Net loan charge-offs in the fourth quarter of 2024 were composed of charge-offs of $58.3 million, primarily consisting of a $49.3 million commercial and industrial loan for which a specific reserve of $26.5 million was held, which was offset by recoveries of $3.1 million.

The Company’s allowance for credit losses as a percentage of period-end loans held for investment was 1.14% at December 31, 2024, compared to 1.25% at September 30, 2024 and 1.25% at December 31, 2023. Excluding the commercial and industrial loan specific reserve of $26.5 million, the Company’s allowance for credit losses as a percentage of period-end loans held for investment increased four basis points compared to September 30, 2024. Coverage of non-performing loans increased to 144.4% at December 31, 2024, compared to 129.2% at September 30, 2024 and decreased from 204.6% at December 31, 2023.

2 Represents a Non-GAAP financial measure. See Non-GAAP Financial Measures included below for a reconciliation to this measure’s most directly comparable GAAP financial measure.

NON-INTEREST INCOME


For the Quarter Ended	Dec 31, 2024		Sep 30, 2024		$ Change		% Change		Dec 31, 2023		$ Change		% Change
(Dollars in millions)
Payment services revenues	$	17.9	$	18.7	$	(0.8)	(4.3)	%	$	18.4	$	(0.5)	(2.7)	%
Mortgage banking revenues	1.5		1.7		(0.2)		(11.8)		1.5		—		NM
Wealth management revenues	10.6		9.6		1.0		10.4		8.8		1.8		20.5
Service charges on deposit accounts	6.7		6.6		0.1		1.5		6.0		0.7		11.7
Other service charges, commissions, and fees	2.5		2.2		0.3		13.6		2.5		—		—

Other income	7.8		7.6		0.2		2.6		7.3		0.5		6.8

Total non-interest income	$	47.0	$	46.4	$	0.6	1.3	%	$	44.5	$	2.5	5.6	%

Non-interest income was $47.0 million for the fourth quarter of 2024, increasing $0.6 million compared to the third quarter of 2024 and increasing $2.5 million compared to the fourth quarter of 2023. The increase was primarily due to wealth management revenues as a result of an increase in trust fees which was partially offset by a decrease in payment services revenues as a result of decreased interchange fees driven by lower transaction volume during the fourth quarter of 2024.

NON-INTEREST EXPENSE


For the Quarter Ended	Dec 31, 2024		Sep 30, 2024		$ Change		% Change		Dec 31, 2023		$ Change		% Change
(Dollars in millions)
Salaries and wages	$	68.5	$	70.9	$	(2.4)	(3.4)	%	$	64.0	$	4.5	7.0	%
Employee benefits	20.5		19.7		0.8		4.1		13.5		7.0		51.9
Occupancy and equipment	18.2		17.0		1.2		7.1		17.4		0.8		4.6
Other intangible amortization	3.6		3.6		—		—		3.9		(0.3)		(7.7)
Other expenses	50.0		48.2		1.8		3.7		67.0		(17.0)		(25.4)
Other real estate owned expense	0.1		—		0.1		—		0.2		(0.1)		(50.0)

Total non-interest expense	$	160.9	$	159.4	$	1.5	0.9	%	$	166.0	$	(5.1)	(3.1)	%

The Company’s non-interest expense was $160.9 million for the fourth quarter of 2024, an increase of $1.5 million from the third quarter of 2024 and a decrease of $5.1 million from the fourth quarter of 2023. Expenses for the third quarter included $3.8 million related to the former CEO severance costs.

Salary and wages expense decreased $2.4 million and increased $4.5 million during the fourth quarter of 2024 compared to the third quarter of 2024 and the fourth quarter of 2023, respectively. The decrease when compared to the third quarter of 2024 was primarily due to the third quarter accrual of $3.8 million related to the former CEO severance costs which were partially offset by $1.4 million of short-term incentive accruals in the fourth quarter. The increase when compared to the fourth quarter of 2023 was primarily due to $8.3 million in short-term incentive accruals and $1.2 million of deferred loan costs, which were partially offset by lower salaries and wages totaling $4.6 million and higher severance costs as a result of the reduction in work force in December 2023.

Employee benefit expenses increased $0.8 million and $7.0 million during the fourth quarter of 2024 compared to the third quarter of 2024 and the fourth quarter of 2023, respectively. The increase compared to the fourth quarter of 2023 was primarily due to higher, normalized long-term incentive accruals of $6.0 million, due to decreased incentive accruals in 2023, and $1.6 million in health insurance costs.

Other expenses increased $1.8 million during the fourth quarter of 2024 compared to the third quarter of 2024, primarily due to professional fees. Other expenses decreased $17.0 million during the fourth quarter of 2024 compared to the fourth quarter of 2023, primarily due to a decrease of $11.3 million of FDIC insurance premiums driven by the FDIC special assessment included in the fourth quarter of 2023 and lower credit card reward accruals and donation expenses.

BALANCE SHEET

Total assets decreased $458.1 million, or 1.5%, to $29,137.4 million as of December 31, 2024, from $29,595.5 million as of September 30, 2024, primarily due to decreases in investment securities and loans, which were partially offset by an increase in cash and cash equivalents. Total assets decreased $1,533.8 million, or 5.0%, from $30,671.2 million as of December 31, 2023, primarily due to decreases in investment securities and loans, which were partially offset by an increase in cash and cash equivalents, which supported declines in other borrowed funds, deposits, and securities sold under repurchase agreements.

Investment securities decreased $531.0 million, or 6.4%, to $7,744.6 million as of December 31, 2024, from $8,275.6 million as of September 30, 2024, primarily resulting from called securities, normal pay-downs and maturities, and a $91.2 million decrease in fair market values of investment securities during the period. Investment securities decreased $1,304.8 million, or 14.4%, from $9,049.4 million as of December 31, 2023, primarily resulting from normal pay-downs and maturities, partially offset by a $43.3 million increase in fair market values during the period.

The following table presents the composition and comparison of loans held for investment as of the quarters-ended:



	Dec 31, 2024		Sep 30, 2024		$ Change		% Change		Dec 31, 2023		$ Change		% Change
Real Estate:
Commercial	$	9,263.2	$	9,219.3	$	43.9	0.5	%	$	8,869.2	$	394.0	4.4	%
Construction	1,244.6		1,307.9		(63.3)		(4.8)		1,826.5		(581.9)		(31.9)
Residential	2,191.6		2,217.8		(26.2)		(1.2)		2,244.3		(52.7)		(2.3)
Agricultural	701.1		726.4		(25.3)		(3.5)		716.8		(15.7)		(2.2)
Total real estate	13,400.5		13,471.4		(70.9)		(0.5)		13,656.8		(256.3)		(1.9)
Consumer:
Indirect	725.0		742.2		(17.2)		(2.3)		740.9		(15.9)		(2.1)
Direct and advance lines	134.0		136.9		(2.9)		(2.1)		141.6		(7.6)		(5.4)
Credit card	77.6		76.4		1.2		1.6		76.5		1.1		1.4
Total consumer	936.6		955.5		(18.9)		(2.0)		959.0		(22.4)		(2.3)
Commercial	2,829.4		2,919.7		(90.3)		(3.1)		2,906.8		(77.4)		(2.7)
Agricultural	687.9		689.8		(1.9)		(0.3)		769.4		(81.5)		(10.6)
Other, including overdrafts	1.6		2.5		(0.9)		(36.0)		0.1		1.5		NM
Deferred loan fees and costs	(11.1)		(11.8)		0.7		(5.9)		(12.5)		1.4		(11.2)
Loans held for investment, net of deferred loan fees and costs	$	17,844.9	$	18,027.1	$	(182.2)	(1.0)	%	$	18,279.6	$	(434.7)	(2.4)	%

The ratio of loans held for investment to deposits was 77.5%, as of December 31, 2024, compared to 78.8% as of September 30, 2024 and 78.4% as of December 31, 2023.

Total deposits increased $151.5 million to $23,015.6 million as of December 31, 2024, from $22,864.1 million as of September 30, 2024, with increases in all interest-bearing categories, which were partially offset by a decrease in non-interest-bearing deposits. Total deposits decreased $307.5 million, or 1.3%, from $23,323.1 million as of December 31, 2023, with decreases in all types of deposits except for savings and time, $250 and over.

Securities sold under repurchase agreements decreased $33.3 million, or 6.0%, to $523.9 million as of December 31, 2024, from $557.2 million as of September 30, 2024, and decreased $258.8 million, or 33.1%, from $782.7 million as of December 31, 2023, resulting from normal fluctuations in the liquidity needs of the Company’s clients.

Other borrowed funds is composed of variable-rate, overnight and fixed-rate borrowings with remaining contractual tenors of up to one year through the Federal Home Loan Bank. Other borrowed funds decreased $512.5 million, or 24.6%, to $1,567.5 million as of December 31, 2024, from $2,080.0 million as of September 30, 2024. The decrease was funded by the repayment of the Bank Term Funding Program borrowing of $1.0 billion supported by higher levels of deposits, cash flows from amortizing investment securities, lower recorded loans, and borrowings of FHLB advances. Other borrowed funds decreased $1,035.5 million from December 31, 2023 as a result of the Company’s pay-off of wholesale borrowings in December 2024.

The Company is considered to be “well-capitalized” as of December 31, 2024, having exceeded all regulatory capital adequacy requirements. During the fourth quarter of 2024, the Company paid regular common stock dividends of approximately $49.0 million, or $0.47 per share.

CREDIT QUALITY

As of December 31, 2024, non-performing assets decreased $33.3 million, or 18.6%, to $145.6 million, compared to $178.9 million as of September 30, 2024, primarily due to a decrease in non-accrual loans partially offset by an increase in accruing loans past due 90 days or more. The decrease in non-accrual loans was primarily due to a $49.3 million commercial and industrial loan relationship charge off and the payoff of a $22.2 million of agricultural loan, which was partially offset by the movement of a $18.9 million agricultural loan, $12.2 million of commercial real estate loans, $3.2 million of commercial loans, and $3.2 million of construction real estate loans to non-accrual during the fourth quarter of 2024.

Criticized loans increased $170.0 million, or 28.2%, to $773.3 million as of December 31, 2024, from $603.3 million as of September 30, 2024, primarily as a result of downgrades of $200.0 million of commercial real estate loans and commercial loans of $52.9 million, driven primarily by four relationships. The increase was partially offset by $49.3 million and $3.5 million of charge-offs related to commercial and commercial real estate loans, respectively, the payoff of $22.2 million of agricultural loans, and commercial real estate loan upgrades of $10.4 million.

NON-GAAP FINANCIAL MEASURES

In addition to results presented in accordance with accounting principles generally accepted in the United States of America, or GAAP, this press release contains the following non-GAAP financial measures that management uses to evaluate our performance relative to our capital adequacy standards: (i) tangible common stockholders’ equity; (ii) tangible assets; (iii) tangible book value per common share; (iv) tangible common stockholders’ equity to tangible assets; (v) average tangible common stockholders’ equity; (vi) return on average tangible common stockholders’ equity; (vii) net FTE interest income; (viii) net FTE interest margin ratio; (ix) adjusted net FTE interest income; and (x) adjusted net FTE interest margin ratio. Tangible common stockholders’ equity is calculated as total common stockholders’ equity less goodwill and other intangible assets (excluding mortgage servicing rights). Tangible assets are calculated as total assets less goodwill and other intangible assets (excluding mortgage servicing rights). Tangible book value per common share is calculated as tangible common stockholders’ equity divided by common shares outstanding. Tangible common stockholders’ equity to tangible assets is calculated as tangible common stockholders’ equity divided by tangible assets. Average tangible common stockholders’ equity is calculated as average total stockholders’ equity less average goodwill and other intangible assets (excluding mortgage servicing rights). Return on average tangible common stockholders’ equity is calculated as annualized net income available to common shareholders divided by average tangible common stockholders’ equity. Net FTE interest income is calculated as net interest income, adjusted to include its FTE interest income. Net FTE interest margin ratio is calculated as net FTE interest income divided by average interest-earning assets. Adjusted net FTE interest income is calculated as net FTE interest income less purchase accounting interest accretion on acquired loans. Adjusted net FTE interest margin ratio is calculated as annualized adjusted net FTE interest income divided by average interest earning assets. These non-GAAP financial measures may not be comparable to similarly titled measures reported by other companies because other companies may not calculate these non-GAAP measures in the same manner. They also should not be considered in isolation or as a substitute for measures prepared in accordance with GAAP.

The Company adjusts the most directly comparable capital adequacy GAAP financial measures to the non-GAAP financial measures described in subclauses (i) through (vi) above to exclude goodwill and other intangible assets (except mortgage servicing rights), adjusts its GAAP net interest income to include fully taxable equivalent adjustments and further adjusts its net interest income on a fully taxable equivalent basis to exclude purchase accounting interest accretion. Management believes these non-GAAP financial measures, which are intended to complement the capital ratios defined by banking regulators and to present on a consistent basis our and our acquired companies’ organic continuing operations without regard to acquisition costs and other adjustments that we consider to be unpredictable and dependent on a significant number of factors that are outside our control, are useful to investors in evaluating the Company’s performance because, as a general matter, they either do not represent an actual cash expense and are inconsistent in amount and frequency depending upon the timing and size of our acquisitions (including the size, complexity and/or volume of past acquisitions, which may drive the magnitude of acquisition related costs, but may not be indicative of the size, complexity and/or volume of future acquisitions or related costs), or they cannot be anticipated or estimated in a particular period (in particular as it relates to unexpected recovery amounts). This impacts the ratios that are important to analysts and allows investors to compare certain aspects of the Company’s capitalization to other companies.

See the Non-GAAP Financial Measures table included herein and the textual discussion for a reconciliation of the above-described non-GAAP financial measures to their most directly comparable GAAP financial measures.

Cautionary Note Regarding Forward-Looking Statements and Factors that Could Affect Future Results

This press release contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, and Rule 3b-6 promulgated thereunder, that involve inherent risks and uncertainties. Any statements about our plans, objectives, expectations, strategies, beliefs, or future performance or events constitute forward-looking statements. Such statements are identified by words or phrases such as “believes,” “expects,” “anticipates,” “plans,” “trends,” “objectives,” “continues” or similar expressions, or future or conditional verbs such as “will,” “would,” “should,” “could,” “might,” “may,” or similar expressions. Forward-looking statements involve known and unknown risks, uncertainties, assumptions, estimates and other important factors that change over time and could cause actual results to differ materially from any results, performance or events expressed or implied by such forward-looking statements. Furthermore, the following factors, among others, may cause actual results to differ materially from current expectations in the forward-looking statements, including those set forth in this press release:

•new or changes in existing, governmental regulations or in the way such regulations are interpreted or enforced;

•negative developments in the banking industry and increased regulatory scrutiny;

•tax legislative initiatives or assessments;

•more stringent capital requirements, to the extent they may become applicable to us;

•changes in accounting standards;

•any failure to comply with applicable laws and regulations, including, but not limited to, the Community Reinvestment Act and fair lending laws, the USA PATRIOT ACT of 2001, the Office of Foreign Asset Control guidelines and requirements, the Bank Secrecy Act, and the related Financial Crimes Enforcement Network and Federal Financial Institutions Examination Council Guidelines and regulations;

•federal deposit insurance increases;

•lending risks and risks associated with loan sector concentrations;

•a decline in economic conditions that could reduce demand for our products and services and negatively impact the credit quality of loans;

•loan credit losses exceeding estimates;

•exposure to losses in collateralized loan obligation securities;

•changes to United States trade policies, including the imposition of tariffs and retaliatory tariffs;

•the soundness of other financial institutions;

•the ability to meet cash flow needs and availability of financing sources for working capital and other needs;

•a loss of deposits or a change in product mix that increases the Company’s funding costs;

•inability to access funding or to monetize liquid assets;

•changes in interest rates;

•interest rate effect on the value of our investment securities;

•cybersecurity risks, including denial-of-service attacks, network intrusions, business e-mail compromise, and other malicious behavior that could result in the disclosure of confidential information;

•privacy, information security, and data protection laws, rules, and regulations that affect or limit how we collect and use personal information or otherwise have an adverse effect on us;

•the potential impairment of our goodwill and other intangible assets;

•our reliance on other companies that provide key components of our business infrastructure;

•events that may tarnish our reputation;

•mainstream and social media contagion;

•the loss of the services of key members of our management team and directors;

•our ability to attract and retain qualified employees to operate our business;

•costs associated with repossessed properties, including environmental remediation;

•the effectiveness of our internal control over financial reporting;

•our ability to implement technology-facilitated products and services or be successful in marketing these products and services to our clients;

•the development and use of artificial intelligence;

•risks related to acquisitions, mergers, strategic partnerships and other transactions;

•competition from new or existing financial institutions and non-banks;

•investing in technology;

•incurrence of significant costs related to mergers and related integration activities;

•the volatility in the price and trading volume of our common stock;

•“anti-takeover” provisions in our certificate of incorporation and regulations, which may make it more difficult for a third party to acquire control of us even in circumstances that could be deemed beneficial to stockholders;

•changes in our dividend policy or our ability to pay dividends;

•our common stock not being an insured deposit;

•the potential dilutive effect of future equity issuances;

•the subordination of our common stock to our existing and future indebtedness;

•the effect of global conditions, earthquakes, volcanoes, tsunamis, floods, fires, drought, and other natural catastrophic events; and

•the impact of climate change and environmental sustainability matters.

These factors are not necessarily all the factors that could cause our actual results, performance, or achievements to differ materially from those expressed in or implied by any of our forward-looking statements. Other unknown or unpredictable factors also could harm our results.

All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements set forth above and included and described in more detail in our periodic reports filed with the Securities and Exchange Commission, or SEC, under the Securities Exchange Act of 1934, as amended, under the caption “Risk Factors.” Interested parties are urged to read in their entirety such risk factors prior to making any investment decision with respect to the Company. Forward-looking statements speak only as of the date they are made, and we do not undertake or assume any obligation to update publicly any of these statements to reflect actual results, new information or future events, changes in assumptions or changes in other factors affecting forward-looking statements, except to the extent required by applicable laws. If we update one or more forward-looking statements, no inference should be drawn that we will make additional updates with respect to those or other forward-looking statements.

Fourth Quarter 2024 Conference Call for Investors

First Interstate BancSystem, Inc. will host a conference call to discuss the results for the fourth quarter of 2024 at 11:00 a.m. Eastern Time (9:00 a.m. Mountain Time) on Thursday, January 30, 2025. The conference call will be accessible by telephone and through the Internet. Participants may join the call by dialing 1-800-549-8228; the access code is 47891. To participate via the Internet, visit www.FIBK.com. The call will be recorded and made available for replay on January 30, 2025, after 1:00 p.m. Eastern Time (11:00 a.m. Mountain Time), through March 1, 2025, prior to 9:00 a.m. Eastern Time (7:00 a.m. Mountain Time), by dialing 1-888-660-6264; the access code is 47891. The call will also be archived on our website, www.FIBK.com, for one year.

About First Interstate BancSystem, Inc.

First Interstate BancSystem, Inc. is a financial and bank holding company focused on community banking. Incorporated in 1971 and headquartered in Billings, Montana, the Company operates banking offices, including detached drive-up facilities, in communities across Arizona, Colorado, Idaho, Iowa, Kansas, Minnesota, Missouri, Montana, Nebraska, North Dakota, Oregon, South Dakota, Washington, and Wyoming, in addition to offering online and mobile banking services. Through our bank subsidiary, First Interstate Bank, the Company delivers a comprehensive range of banking products and services to individuals, businesses, municipalities, and others throughout the Company’s market areas.

Contact:

David Della Camera, CFA

NASDAQ: FIBK

Deputy Chief Financial Officer
First Interstate BancSystem, Inc.
(406) 255-5363
investor.relations@fib.com

www.FIBK.com

(FIBK-ER)

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Consolidated Statements of Income

(Unaudited)


	Quarter Ended										% Change
(In millions, except % and per share data)	Dec 31, 2024		Sep 30, 2024		Jun 30, 2024		Mar 31, 2024		Dec 31, 2023		4Q24 vs 3Q24		4Q24 vs 4Q23
Net interest income	$	214.3	$	205.5	$	201.7	$	200.1	$	207.8	4.3	%	3.1	%
Net interest income on a fully-taxable equivalent ("FTE") basis	215.9		207.1		203.4		201.8		209.5		4.2		3.1
Provision for credit losses	33.7		19.8		9.0		5.3		5.4		70.2		NM
Non-interest income:
Payment services revenues	17.9		18.7		18.6		18.4		18.4		(4.3)		(2.7)
Mortgage banking revenues	1.5		1.7		1.7		1.7		1.5		(11.8)		NM
Wealth management revenues	10.6		9.6		9.4		9.2		8.8		10.4		20.5
Service charges on deposit accounts	6.7		6.6		6.4		6.0		6.0		1.5		11.7
Other service charges, commissions, and fees	2.5		2.2		2.1		2.2		2.5		13.6		—
Total fee-based revenues	39.2		38.8		38.2		37.5		37.2		1.0		5.4

Other income	7.8		7.6		4.4		4.6		7.3		2.6		6.8

Total non-interest income	47.0		46.4		42.6		42.1		44.5		1.3		5.6
Non-interest expense:
Salaries and wages	68.5		70.9		66.3		65.2		64.0		(3.4)		7.0
Employee benefits	20.5		19.7		16.9		19.3		13.5		4.1		51.9
Occupancy and equipment	18.2		17.0		16.9		17.3		17.4		7.1		4.6
Other intangible amortization	3.6		3.6		3.7		3.7		3.9		—		(7.7)
Other expenses	50.0		48.2		51.1		52.7		67.0		3.7		(25.4)
Other real estate owned expense	0.1		—		2.0		2.0		0.2		—		(50.0)

Total non-interest expense	160.9		159.4		156.9		160.2		166.0		0.9		(3.1)
Income before income tax	66.7		72.7		78.4		76.7		80.9		(8.3)		(17.6)
Provision for income tax	14.6		17.2		18.4		18.3		19.4		(15.1)		(24.7)
Net income	$	52.1	$	55.5	$	60.0	$	58.4	$	61.5	(6.1)	%	(15.3)	%

Weighted-average basic shares outstanding	103,083		102,971		102,937		102,844		103,629		0.1	%	(0.5)	%
Weighted-average diluted shares outstanding	103,399		103,234		103,093		103,040		103,651		0.2		(0.2)
Earnings per share - basic	$	0.51	$	0.54	$	0.58	$	0.57	$	0.59	(5.6)		(13.6)
Earnings per share - diluted	0.50		0.54		0.58		0.57		0.59		(7.4)		(15.3)





NM - not meaningful

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Consolidated Statements of Income

(Unaudited)


	Year Ended December 31,				% Change
(In millions, except % and per share data)	2024		2023		2024 vs 2023
Net interest income	$	821.6	$	878.8	(6.5)
Net interest income on a FTE basis	828.2		885.8		(6.5)
Provision for credit losses	67.8		32.2		110.6
Non-interest income:
Payment services revenues	73.6		76.4		(3.7)
Mortgage banking revenues	6.6		8.4		(21.4)
Wealth management revenues	38.8		35.3		9.9
Service charges on deposit accounts	25.7		23.0		11.7
Other service charges, commissions, and fees	9.0		9.5		(5.3)
Total fee-based revenues	153.7		152.6		0.7
Investment securities gain	—		(23.5)		NM
Other income	24.4		17.9		36.3

Total non-interest income	178.1		147.0		21.2
Non-interest expense:
Salaries and wages	270.9		263.1		3.0
Employee benefits	76.4		75.3		1.5
Occupancy and equipment	69.4		70.1		(1.0)
Other intangible amortization	14.6		15.7		(7.0)
Other expenses	202.0		231.1		(12.6)
Other real estate owned expense	4.1		1.5		NM

Total non-interest expense	637.4		656.8		(3.0)
Income before income tax	294.5		336.8		(12.6)
Provision for income tax	68.5		79.3		(13.6)
Net income	$	226.0	$	257.5	(12.2)

Weighted-average basic shares outstanding	102,978		103,752		(0.7)
Weighted-average diluted shares outstanding	103,191		103,780		(0.6)
Earnings per share - basic	$	2.19	$	2.48	(11.7)
Earnings per share - diluted	2.19		2.48		(11.7)




NM - not meaningful

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Consolidated Balance Sheets

(Unaudited)


											% Change
(In millions, except % and per share data)	Dec 31, 2024		Sep 30, 2024		Jun 30, 2024		Mar 31, 2024		Dec 31, 2023		4Q24 vs 3Q24		4Q24 vs 4Q23
Assets:
Cash and due from banks	$	378.0	$	438.9	$	390.2	$	315.8	$	378.2	(13.9)	%	(0.1)	%
Interest-bearing deposits in banks	518.5		259.6		568.2		319.1		199.7		99.7		159.6
Federal funds sold	0.1		0.1		0.1		0.1		0.1		—		—
Cash and cash equivalents	896.6		698.6		958.5		635.0		578.0		28.3		55.1

Investment securities, net	7,744.6		8,275.6		8,401.6		8,626.1		9,049.4		(6.4)		(14.4)
Investment in Federal Home Loan Bank and Federal Reserve Bank stock	177.4		155.5		182.3		178.4		223.2		14.1		(20.5)
Loans held for sale, at fair value	0.9		20.9		22.3		22.7		47.4		(95.7)		(98.1)
Loans held for investment	17,844.9		18,027.1		18,235.0		18,202.8		18,279.6		(1.0)		(2.4)
Allowance for credit losses	(204.1)		(225.4)		(232.8)		(227.7)		(227.7)		(9.4)		(10.4)
Net loans held for investment	17,640.8		17,801.7		18,002.2		17,975.1		18,051.9		(0.9)		(2.3)
Goodwill and intangible assets (excluding mortgage servicing rights)	1,195.7		1,199.3		1,202.9		1,206.6		1,210.3		(0.3)		(1.2)
Company owned life insurance	513.0		511.0		507.6		504.7		502.4		0.4		2.1
Premises and equipment	427.2		432.7		436.5		439.9		444.3		(1.3)		(3.8)
Other real estate owned	4.3		4.4		6.7		14.4		16.5		(2.3)		(73.9)
Mortgage servicing rights	25.7		26.3		27.0		27.6		28.3		(2.3)		(9.2)
Other assets	511.2		469.5		541.9		514.3		519.5		8.9		(1.6)
Total assets	$	29,137.4	$	29,595.5	$	30,289.5	$	30,144.8	$	30,671.2	(1.5)	%	(5.0)	%

Liabilities and stockholders' equity:
Deposits	$	23,015.6	$	22,864.1	$	22,870.7	$	22,810.0	$	23,323.1	0.7	%	(1.3)	%
Securities sold under repurchase agreements	523.9		557.2		741.8		794.2		782.7		(6.0)		(33.1)
Long-term debt	132.2		137.3		383.4		370.8		120.8		(3.7)		9.4
Other borrowed funds	1,567.5		2,080.0		2,430.0		2,342.0		2,603.0		(24.6)		(39.8)
Subordinated debentures held by subsidiary trusts	163.1		163.1		163.1		163.1		163.1		—		—
Other liabilities	431.1		428.0		475.2		455.0		451.0		0.7		(4.4)
Total liabilities	25,833.4		26,229.7		27,064.2		26,935.1		27,443.7		(1.5)		(5.9)
Stockholders' equity:
Common stock	2,459.5		2,457.4		2,453.9		2,450.7		2,448.9		0.1		0.4
Retained earnings	1,166.4		1,163.3		1,156.9		1,145.9		1,135.1		0.3		2.8
Accumulated other comprehensive loss	(321.9)		(254.9)		(385.5)		(386.9)		(356.5)		26.3		(9.7)
Total stockholders' equity	3,304.0		3,365.8		3,225.3		3,209.7		3,227.5		(1.8)		2.4
Total liabilities and stockholders' equity	$	29,137.4	$	29,595.5	$	30,289.5	$	30,144.8	$	30,671.2	(1.5)	%	(5.0)	%

Common shares outstanding at period end	104,586		104,530		104,561		104,572		103,942		0.1	%	0.6	%
Book value per common share at period end	$	31.59	$	32.20	$	30.85	$	30.69	$	31.05	(1.9)		1.7
Tangible book value per common share at period end**	20.16		20.73		19.34		19.16		19.41		(2.7)		3.9




**Non-GAAP financial measure - see Non-GAAP Financial Measures included herein for a reconciliation of book value per common share (GAAP) at period end to tangible book value per common share (non-GAAP) at period end.

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Loans and Deposits

(Unaudited)


											% Change
(In millions, except %)	Dec 31, 2024		Sep 30, 2024		Jun 30, 2024		Mar 31, 2024		Dec 31, 2023		4Q24 vs 3Q24		4Q24 vs 4Q23

Loans held for investment:
Real Estate:
Commercial	$	9,263.2	$	9,219.3	$	9,054.5	$	9,060.4	$	8,869.2	0.5	%	4.4	%
Construction	1,244.6		1,307.9		1,519.9		1,609.2		1,826.5		(4.8)		(31.9)
Residential	2,191.6		2,217.8		2,246.4		2,258.4		2,244.3		(1.2)		(2.3)
Agricultural	701.1		726.4		723.5		719.7		716.8		(3.5)		(2.2)
Total real estate	13,400.5		13,471.4		13,544.3		13,647.7		13,656.8		(0.5)		(1.9)
Consumer:
Indirect	725.0		742.2		733.7		739.9		740.9		(2.3)		(2.1)
Direct	134.0		136.9		139.0		136.7		141.6		(2.1)		(5.4)
Credit card	77.6		76.4		76.1		72.6		76.5		1.6		1.4
Total consumer	936.6		955.5		948.8		949.2		959.0		(2.0)		(2.3)
Commercial	2,829.4		2,919.7		3,052.9		2,922.2		2,906.8		(3.1)		(2.7)
Agricultural	687.9		689.8		698.2		696.0		769.4		(0.3)		(10.6)
Other	1.6		2.5		3.1		0.2		0.1		(36.0)		NM
Deferred loan fees and costs	(11.1)		(11.8)		(12.3)		(12.5)		(12.5)		(5.9)		(11.2)
Loans held for investment	$	17,844.9	$	18,027.1	$	18,235.0	$	18,202.8	$	18,279.6	(1.0)	%	(2.4)	%






Deposits:
Non-interest-bearing	$	5,797.6	$	5,919.0	$	6,174.0	$	5,900.3	$	6,029.6	(2.1)	%	(3.8)	%
Interest-bearing:
Demand	6,495.2		6,261.4		6,122.3		6,103.6		6,507.8		3.7		(0.2)
Savings	7,832.3		7,805.5		7,733.6		7,872.2		7,775.8		0.3		0.7
Time, $250 and over	825.0		818.6		786.1		819.3		811.6		0.8		1.7
Time, other	2,065.5		2,059.6		2,054.7		2,114.6		2,198.3		0.3		(6.0)
Total interest-bearing	17,218.0		16,945.1		16,696.7		16,909.7		17,293.5		1.6		(0.4)
Total deposits	$	23,015.6	$	22,864.1	$	22,870.7	$	22,810.0	$	23,323.1	0.7	%	(1.3)	%

Total core deposits (1)	$	22,190.6	$	22,045.5	$	22,084.6	$	21,990.7	$	22,511.5	0.7	%	(1.4)	%

(1) Core deposits are defined as total deposits less time deposits, $250 thousand and over, and brokered deposits.

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Credit Quality

(Unaudited)


																% Change
(In millions, except %)	Dec 31, 2024			Sep 30, 2024			Jun 30, 2024			Mar 31, 2024			Dec 31, 2023			4Q24 vs 3Q24		4Q24 vs 4Q23

Allowance for Credit Losses:
Allowance for credit losses	$	204.1		$	225.4		$	232.8		$	227.7		$	227.7		(9.4)	%	(10.4)	%
As a percentage of loans held for investment	1.14		%	1.25		%	1.28		%	1.25		%	1.25		%
As a percentage of non-accrual loans	147.58			130.52			140.58			132.38			214.00

Net loan charge-offs during quarter	$	55.2		$	27.4		$	13.5		$	8.4		$	4.8		101.5	%	NM
Annualized as a percentage of average loans	1.22		%	0.60		%	0.30		%	0.18		%	0.10		%

Non-Performing Assets:
Non-accrual loans	$	138.3		$	172.7		$	165.6		$	172.0		$	106.4		(19.9)	%	30.0	%
Accruing loans past due 90 days or more	3.0			1.8			2.6			3.0			4.9			66.7		(38.8)
Total non-performing loans	141.3			174.5			168.2			175.0			111.3			(19.0)		27.0
Other real estate owned	4.3			4.4			6.7			14.4			16.5			(2.3)		(73.9)
Total non-performing assets	$	145.6		$	178.9		$	174.9		$	189.4		$	127.8		(18.6)	%	13.9	%

Non-performing assets as a percentage of:
Loans held for investment and OREO	0.82		%	0.99		%	0.96		%	1.04		%	0.70		%
Total assets	0.50			0.60			0.58			0.63			0.42

Non-accrual loans to loans held for investment	0.78			0.96			0.91			0.94			0.58

Accruing Loans 30-89 Days Past Due	$	63.5		$	40.7		$	46.4		$	62.8		$	67.3		56.0	%	(5.6)	%


Criticized Loans:
Special Mention	$	316.4		$	188.9		$	162.7		$	160.1		$	210.5		67.5	%	50.3	%
Substandard	434.8			365.9			409.3			405.8			457.1			18.8		(4.9)
Doubtful	22.1			48.5			46.0			64.1			20.7			(54.4)		6.8
Total	$	773.3		$	603.3		$	618.0		$	630.0		$	688.3		28.2	%	12.3	%



NM - not meaningful

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Selected Ratios - Annualized

(Unaudited)


	At or for the Quarter ended:
	Dec 31, 2024				Sep 30, 2024			Jun 30, 2024			Mar 31, 2024			Dec 31, 2023
Annualized Financial Ratios (GAAP)
Return on average assets	0.70		%		0.74		%	0.80		%	0.77		%	0.80		%
Return on average common stockholders' equity	6.22				6.68			7.55			7.28			7.77
Yield on average earning assets	4.86				4.83			4.80			4.74			4.69
Cost of average interest-bearing liabilities	2.23				2.41			2.39			2.39			2.24
Interest rate spread	2.63				2.42			2.41			2.35			2.45
Efficiency ratio	60.20				61.85			62.71			64.62			64.25
Loans held for investment to deposit ratio	77.53				78.84			79.73			79.80			78.38

Annualized Financial Ratios - Operating** (Non-GAAP)
Net FTE interest margin ratio	3.20		%		3.04		%	3.00		%	2.93		%	3.01		%
Tangible book value per common share	$	20.16			$	20.73		$	19.34		$	19.16		$	19.41
Tangible common stockholders' equity to tangible assets	7.55		%		7.63		%	6.95		%	6.92		%	6.85		%
Return on average tangible common stockholders' equity	9.71				10.48			12.12			11.63			12.65

Consolidated Capital Ratios
Total risk-based capital to total risk-weighted assets	14.38		%	*	14.11		%	13.80		%	13.64		%	13.28		%
Tier 1 risk-based capital to total risk-weighted assets	12.16			*	11.83			11.53			11.37			11.08
Tier 1 common capital to total risk-weighted assets	12.16			*	11.83			11.53			11.37			11.08
Leverage Ratio	8.71			*	8.57			8.44			8.28			8.22




*Preliminary estimate - may be subject to change. The regulatory capital ratios presented include the assumption of the transitional method as a result of legislation by the United States Congress to provide relief for the economy and financial institutions in the United States from the COVID‑19 pandemic. The referenced relief ends on December 31, 2024, which allows a total five-year phase-in of the impact of CECL on capital and relief over the next two years for the impact on the allowance for credit losses resulting from the COVID‑19 pandemic.
**Non-GAAP financial measures - see Non-GAAP Financial Measures included herein for a reconciliation of net interest margin to net FTE interest margin, book value per common share to tangible book value per common share, return on average common stockholders’ equity (GAAP) to return on average tangible common stockholders’ equity, and tangible common stockholders’ equity to tangible assets (non-GAAP).

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Selected Ratios - Annualized

(Unaudited)


	At or for the Year ended:
	Dec 31, 2024		Dec 31, 2023
Financial Ratios (GAAP)
Return on average assets	0.75	%	0.83	%
Return on average common stockholders' equity	6.92		8.17
Yield on average earning assets	4.81		4.57
Cost of average interest-bearing liabilities	2.35		1.91
Interest rate spread	2.46		2.66
Efficiency ratio	62.30		62.50

Financial Ratios - Operating** (Non-GAAP)
Net FTE interest margin ratio	3.04		3.14
Return on average tangible common stockholders' equity	10.95		13.32







**Non-GAAP financial measures - see Non-GAAP Financial Measures included herein for a reconciliation of net interest margin to net FTE interest margin and return on average common stockholders’ equity (GAAP) to return on average tangible common stockholders’ equity (non-GAAP).

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Average Balance Sheets

(Unaudited)



	Three Months Ended
	December 31, 2024						September 30, 2024						December 31, 2023
(In millions, except %)	Average Balance		Interest(2)		Average Rate		Average Balance		Interest(2)		Average Rate		Average Balance		Interest(2)		Average Rate
Interest-earning assets:
Loans (1)	$	17,977.7	$	259.9	5.75	%	$	18,209.1	$	260.3	5.69	%	$	18,255.9	$	254.1	5.52	%
Investment securities
Taxable	7,804.1		56.0		2.85		8,209.7		60.7		2.94		8,710.1		64.8		2.95
Tax-exempt	183.8		0.8		1.73		185.3		0.9		1.93		190.0		0.9		1.88
Investment in FHLB and FRB stock	155.7		2.4		6.13		176.0		2.8		6.33		192.1		3.1		6.40
Interest-bearing deposits in banks	690.2		8.3		4.78		353.1		4.9		5.52		221.0		3.1		5.57
Federal funds sold	0.1		—		—		0.1		—		—		0.3		—		—
Total interest-earning assets	$	26,811.6	$	327.4	4.86	%	$	27,133.3	$	329.6	4.83	%	$	27,569.4	$	326.0	4.69	%
Non-interest-earning assets	2,807.3						2,813.6						2,938.3
Total assets	$	29,618.9					$	29,946.9					$	30,507.7
Interest-bearing liabilities:
Demand deposits	$	6,449.7	$	15.9	0.98	%	$	6,143.9	$	15.1	0.98	%	$	6,469.1	$	15.3	0.94	%
Savings deposits	7,833.6		39.1		1.99		7,763.4		42.2		2.16		7,769.3		37.4		1.91
Time deposits	2,877.8		26.7		3.69		2,863.1		26.9		3.74		3,179.4		27.2		3.39
Repurchase agreements	529.4		1.1		0.83		643.9		1.4		0.86		842.2		2.1		0.99
Other borrowed funds	1,942.6		24.0		4.91		2,526.6		32.0		5.04		2,087.6		29.7		5.64
Long-term debt	135.0		1.5		4.42		147.2		1.6		4.32		120.8		1.4		4.60
Subordinated debentures held by subsidiary trusts	163.1		3.2		7.81		163.1		3.3		8.05		163.1		3.4		8.27
Total interest-bearing liabilities	$	19,931.2	$	111.5	2.23	%	$	20,251.2	$	122.5	2.41	%	$	20,631.5	$	116.5	2.24	%
Non-interest-bearing deposits	5,899.8						5,927.2						6,222.1
Other non-interest-bearing liabilities	455.8						461.4						513.8
Stockholders’ equity	3,332.1						3,307.1						3,140.3
Total liabilities and stockholders’ equity	$	29,618.9					$	29,946.9					$	30,507.7
Net FTE interest income (non-GAAP)(3)			$	215.9					$	207.1					$	209.5
Less FTE adjustments (2)			(1.6)						(1.6)						(1.7)
Net interest income from consolidated statements of income			$	214.3					$	205.5					$	207.8
Interest rate spread					2.63	%					2.42	%					2.45	%
Net interest margin					3.18						3.01						2.99
Net FTE interest margin (non-GAAP)(3)					3.20						3.04						3.01
Cost of funds, including non-interest-bearing demand deposits (4)					1.72						1.86						1.72

(1) Average loan balances include loans held for sale and loans held for investment, net of deferred fees and costs, which include non-accrual loans. Interest income includes amortization of deferred loan fees net of deferred loan costs, which is not material.
(2) Management believes fully taxable equivalent, or FTE, interest income is useful to investors in evaluating the Company’s performance as a comparison of the returns between a tax-free investment and a taxable alternative. The Company adjusts interest income and average rates for tax exempt loans and securities to an FTE basis utilizing a 21.00% tax rate.
(3) Non-GAAP financial measure - see Non-GAAP Financial Measures included herein for a reconciliation to GAAP measures.
(4) Calculated by dividing total annualized interest on interest-bearing liabilities by the sum of total interest-bearing liabilities plus non-interest-bearing deposits.

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Average Balance Sheets

(Unaudited)



	Year Ended December 31,
	2024						2023
(In millions, except %)	Average Balance		Interest(2)		Average Rate		Average Balance		Interest(2)		Average Rate
Interest earning assets:
Loans (1)	$	18,182.0	$	1,028.2	5.66	%	$	18,299.6	$	986.0	5.39	%
Investment securities
Taxable	8,261.5		243.5		2.95		9,173.1		269.1		2.93
Tax-exempt	186.5		3.4		1.82		199.7		3.9		1.95
Investment in FHLB and FRB stock	178.8		11.8		6.60		207.5		12.4		5.98
Interest-bearing deposits in banks	422.5		22.2		5.25		303.0		15.7		5.18
Federal funds sold	0.1		—		—		0.5		—		—
Total interest-earning assets	$	27,231.4	$	1,309.1	4.81	%	$	28,183.4	$	1,287.1	4.57	%
Non-interest-earning assets	2,825.0						2,951.1
Total assets	$	30,056.4					$	31,134.5
Interest-bearing liabilities:
Demand deposits	$	6,224.9	$	57.8	0.93	%	$	6,553.3	$	47.2	0.72	%
Savings deposits	7,784.8		161.2		2.07		7,989.3		122.2		1.53
Time deposits	2,894.1		106.9		3.69		2,676.3		73.2		2.74
Repurchase agreements	687.2		6.7		0.97		940.4		6.4		0.68
Other borrowed funds	2,434.7		123.4		5.07		2,514.6		133.8		5.32
Long-term debt	253.4		11.8		4.66		120.8		5.8		4.80
Subordinated debentures held by subsidiary trusts	163.1		13.1		8.03		163.1		12.7		7.79
Total interest-bearing liabilities	$	20,442.2	$	480.9	2.35	%	$	20,957.8	$	401.3	1.91	%
Non-interest-bearing deposits	5,879.4						6,549.9
Other non-interest-bearing liabilities	468.8						475.9
Stockholders’ equity	3,266.0						3,150.9
Total liabilities and stockholders’ equity	$	30,056.4					$	31,134.5
Net FTE interest income (non-GAAP)(3)			$	828.2					$	885.8
Less FTE adjustments (2)			(6.6)						(7.0)
Net interest income from consolidated statements of income			$	821.6					$	878.8
Interest rate spread					2.46	%					2.66	%
Net interest margin					3.02						3.33
Net FTE interest margin (3)					3.04						3.14
Cost of funds, including non-interest-bearing demand deposits (4)					1.83						1.46

(1) Average loan balances include mortgage loans held for sale and non-accrual loans. Interest income on loans includes amortization of deferred loan fees net of deferred loan costs of $3.4 million and $1.3 million at December 31, 2024 and December 31, 2023, respectively.
(2) Management believes fully taxable equivalent, or FTE, interest income is useful to investors in evaluating the Company’s performance as a comparison of the returns between a tax-free investment and a taxable alternative. The Company adjusts interest income and average rates for tax exempt loans and securities to an FTE basis utilizing a 21.00% tax rate.
(3) Non-GAAP financial measure - see Non-GAAP Financial Measures included herein for a reconciliation to GAAP measures.
(4) Calculated by dividing total annualized interest on interest-bearing liabilities by the sum of total interest-bearing liabilities plus non-interest-bearing deposits.

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Non-GAAP Financial Measures

(Unaudited)



		As of or For the Quarter Ended
(In millions, except % and per share data)		Dec 31, 2024			Sep 30, 2024			Jun 30, 2024			Mar 31, 2024			Dec 31, 2023
Total common stockholders' equity (GAAP)	(A)	$	3,304.0		$	3,365.8		$	3,225.3		$	3,209.7		$	3,227.5
Less goodwill and other intangible assets (excluding mortgage servicing rights)		1,195.7			1,199.3			1,202.9			1,206.6			1,210.3
Tangible common stockholders' equity (Non-GAAP)	(B)	$	2,108.3		$	2,166.5		$	2,022.4		$	2,003.1		$	2,017.2

Total assets (GAAP)		$	29,137.4		$	29,595.5		$	30,289.5		$	30,144.8		$	30,671.2
Less goodwill and other intangible assets (excluding mortgage servicing rights)		1,195.7			1,199.3			1,202.9			1,206.6			1,210.3
Tangible assets (Non-GAAP)	(C)	$	27,941.7		$	28,396.2		$	29,086.6		$	28,938.2		$	29,460.9

Average Balances:
Total common stockholders' equity (GAAP)	(D)	$	3,332.1		$	3,307.1		$	3,195.3		$	3,228.4		$	3,140.3
Less goodwill and other intangible assets (excluding mortgage servicing rights)		1,197.4			1,201.0			1,204.6			1,208.4			1,212.1
Average tangible common stockholders' equity (Non-GAAP)	(E)	$	2,134.7		$	2,106.1		$	1,990.7		$	2,020.0		$	1,928.2

Net interest income	(F)	$	214.3		$	205.5		$	201.7		$	200.1		$	207.8
FTE interest income		1.6			1.6			1.7			1.7			1.7
Net FTE interest income (Non-GAAP)	(G)	215.9			207.1			203.4			201.8			209.5
Less purchase accounting accretion		8.6			4.4			5.1			6.5			5.4

Adjusted net FTE interest income (Non-GAAP)	(H)	$	207.3		$	202.7		$	198.3		$	195.3		$	204.1

Average interest-earning assets	(I)	$	26,811.6		$	27,133.3		$	27,286.9		$	27,699.6		$	27,569.4



Total quarterly average assets	(J)	29,618.9			29,946.9			30,140.6			30,525.2			30,507.7
Annualized net income available to common shareholders	(K)	207.3			220.8			241.3			234.9			244.0
Common shares outstanding	(L)	104,586			104,530			104,561			104,572			103,942

Return on average assets (GAAP)	(K) / (J)	0.70		%	0.74		%	0.80		%	0.77		%	0.80		%
Return on average common stockholders' equity (GAAP)	(K) / (D)	6.22			6.68			7.55			7.28			7.77
Average common stockholders' equity to average assets (GAAP)	(D) / (J)	11.25			11.04			10.60			10.58			10.29
Book value per common share (GAAP)	(A) / (L)	$	31.59		$	32.20		$	30.85		$	30.69		$	31.05
Tangible book value per common share (Non-GAAP)	(B) / (L)	20.16			20.73			19.34			19.16			19.41
Tangible common stockholders' equity to tangible assets (Non-GAAP)	(B) / (C)	7.55		%	7.63		%	6.95		%	6.92		%	6.85		%
Return on average tangible common stockholders' equity (Non-GAAP)	(K) / (E)	9.71			10.48			12.12			11.63			12.65
Net interest margin (GAAP)	(F*) / (I)	3.18			3.01			2.97			2.91			2.99
Net FTE interest margin (Non-GAAP)	(G*) / (I)	3.20			3.04			3.00			2.93			3.01
Adjusted FTE net interest margin (Non-GAAP)	(H*) / (I)	3.08			2.97			2.92			2.84			2.94

*Annualized

FIRST INTERSTATE BANCSYSTEM, INC. AND SUBSIDIARIES

Non-GAAP Financial Measures

(Unaudited)



		For the Year Ended
(In millions, except % and per share data)		Dec 31, 2024			Dec 31, 2023








Average Balances:
Total common stockholders' equity (GAAP)	(A)	$	3,266.0		$	3,150.9
Less goodwill and other intangible assets (excluding mortgage servicing rights)		1,202.8			1,217.9
Average tangible common stockholders' equity (Non-GAAP)	(B)	$	2,063.2		$	1,933.0

Net interest income	(C)	$	821.6		$	878.8
FTE interest income		6.6			7.0
Net FTE interest income	(D)	828.2			885.8
Less: Purchase accounting accretion		24.6			20.4

Adjusted net interest income (FTE)	(E)	$	803.6		$	865.4

Average interest-earning assets	(F)	$	27,231.4		$	28,183.4



Total average assets	(G)	30,056.4			31,134.5
Net income available to common shareholders	(H)	226.0			257.5


Return on average assets (GAAP)	(H) / (G)	0.75		%	0.83		%
Return on average common stockholders' equity (GAAP)	(H) / (A)	6.92			8.17
Average common stockholders' equity to average assets (GAAP)	(A) / (G)	10.87			10.12



Return on average tangible common stockholders' equity (Non-GAAP)	(H) / (B)	10.95			13.32
Net interest margin (GAAP)	(C) / (F)	3.02			3.12
Net interest margin (FTE) (Non-GAAP)	(D) / (F)	3.04			3.14
Adjusted net interest margin (FTE) (Non-GAAP)	(E) / (F)	2.95			3.07

First Interstate BancSystem, Inc.

P.O. Box 30918 Billings, Montana 59116 (406) 255-5311

www.FIBK.com

4Q 2024 Investor Presentation Exhibit 99.2 January 29, 2025

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS This presentation contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, that involve inherent risks and uncertainties. Any statements about our plans, objectives, expectations, strategies, beliefs, or future performance or events constitute forward-looking statements. Such statements are identified by words or phrases such as “believes,” “expects,” “anticipates,” “plans,” “trends,” “objectives,” “continues”, “projected”, or similar expressions, or future or conditional verbs such as “will,” “would,” “should,” “could,” “might,” “may” or similar expressions. Forward- looking statements involve known and unknown risks, uncertainties, assumptions, estimates and other important factors that could cause actual results to differ materially from any results, performance or events expressed or implied by such forward-looking statements. The following factors, among others, may cause actual results to differ materially from current expectations in the forward-looking statements, including those set forth in this presentation: new or changes in existing, governmental regulations or in the way such regulations are interpreted or enforced; negative developments in the banking industry and increased regulatory scrutiny; tax legislative initiatives or assessments; more stringent capital requirements, to the extent they may become applicable to us; changes in accounting standards; any failure to comply with applicable laws and regulations, including, but not limited to, the Community Reinvestment Act and fair lending laws, the USA PATRIOT ACT of 2001, the Office of Foreign Asset Control guidelines and requirements, the Bank Secrecy Act, and the related Financial Crimes Enforcement Network and Federal Financial Institutions Examination Council Guidelines and regulations; federal deposit insurance increases; lending risks and risks associated with loan sector concentrations; a decline in economic conditions that could reduce demand for our products and services and negatively impact the credit quality of loans; loan credit losses exceeding estimates; exposure to losses in collateralized loan obligation securities; changes to United States trade policies, including the imposition of tariffs and retaliatory tariffs; the soundness of other financial institutions; the ability to meet cash flow needs and availability of financing sources for working capital and other needs; a loss of deposits or a change in product mix that increases the Company’s funding costs; inability to access funding or to monetize liquid assets; changes in interest rates; interest rate effect on the value of our investment securities; cybersecurity risks, including denial-of-service attacks, network intrusions, business e-mail compromise, and other malicious behavior that could result in the disclosure of confidential information; privacy, information security, and data protection laws, rules, and regulations that affect or limit how we collect and use personal information or otherwise have an adverse effect on us; the potential impairment of our goodwill and other intangible assets; our reliance on other companies that provide key components of our business infrastructure; events that may tarnish our reputation; mainstream and social media contagion; the loss of the services of key members of our management team and directors; our ability to attract and retain qualified employees to operate our business; costs associated with repossessed properties, including environmental remediation; the effectiveness of our internal control over financial reporting; our ability to implement technology-facilitated products and services or be successful in marketing these products and services to our clients; the development and use of artificial intelligence; risks related to acquisitions, mergers, strategic partnerships and other transactions; competition from new or existing financial institutions and non-banks; investing in technology; incurrence of significant costs related to mergers and related integration activities; the volatility in the price and trading volume of our common stock; “anti-takeover” provisions in our certificate of incorporation and regulations, which may make it more difficult for a third party to acquire control of us even in circumstances that could be deemed beneficial to stockholders; changes in our dividend policy or our ability to pay dividends; our common stock not being an insured deposit; the potential dilutive effect of future equity issuances; the subordination of our common stock to our existing and future indebtedness; the effect of global conditions, earthquakes, volcanoes, tsunamis, floods, fires, drought, and other natural catastrophic events; and the impact of climate change and environmental sustainability matters. The foregoing factors are not necessarily all of the factors that could cause our actual results, performance or achievements to differ materially from those expressed in or implied by any of our forward-looking statements. Other unknown or unpredictable factors also could harm our results. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements set forth above and included in our periodic reports filed with the Securities and Exchange Commission, or SEC, under the Securities Exchange Act of 1934, as amended, under the caption “Risk Factors”. Interested parties are urged to read in their entirety such risk factors prior to making any investment decision with respect to the Company. Forward-looking statements speak only as of the date they are made and we do not undertake or assume any obligation to update publicly any of these statements to reflect actual results, new information or future events, changes in assumptions or changes in other factors affecting forward- looking statements, except to the extent required by applicable laws. If we update one or more forward-looking statements, no inference should be drawn that we will make additional updates with respect to those or other forward-looking statements. 2

FIRST INTERSTATE BANCSYSTEM, INC. OVERVIEW Premier community banking institution in growing markets throughout the Midwest and Pacific Northwest Financial Highlights Balance Sheet Capital Assets $29.1 Billion Total RBC3** 14.38% LHFI1 $17.8 Billion CET14** 12.16% Deposits $23.0 Billion Leverage** 8.71% ACL2/LHFI 1.14% TCE ratio5 7.55% 1Loans held for investment (LHFI) 3Risk based capital (RBC) 2Allowance for credit losses (ACL) 4Common equity tier-1 (CET1) 5Tangible common equity (TCE) (Non-GAAP) Corporate Overview Headquarters Billings, MT Exchange/Listing NASDAQ: FIBK Market Capitalization* $3.4 Billion Annualized Dividend Yield 5.8% Branch Network 300 banking offices Sub Debt Rating Kroll BBB 3 300 banking offices in 14 states * Calculated using closing stock price of $32.47 as of 12/31/2024 ** Preliminary estimates - may be subject to change

Earnings • Net income of $52.1 million, or $0.50 per share for the fourth quarter of 2024. • Net interest margin (NIM) of 3.18%, an increase of 17 basis points from the third quarter of 2024, NIM on a fully taxable equivalent (“FTE”) basis1, of 3.20%, an increase of 16 basis points from the third quarter of 2024; adjusted FTE NIM1 of 3.08%, an increase of 11 basis points from the third quarter of 2024. • Efficiency ratio2 of 60.2% for the fourth quarter of 2024 Balance Sheet • Loans decreased by $182.2 million, or 4.0% annualized, from the third quarter of 2024, driven by declines in all categories except for Commercial Real Estate and Credit card; the increase in Commercial Real Estate loans was driven by construction loans moving to permanent financing. • Deposits increased by $151.5 million from the third quarter of 2024 driven by increases in interest bearing demand deposits. • The Company’s balance sheet continues to maintain a strong liquidity position, with a loan/deposit ratio of 77.5% as of the fourth quarter of 2024. Short-term borrowings declined $512.5 million as a result of a decrease in investment securities, an increase in deposits, and a decrease in loan balances. Asset Quality • Criticized loans increased $170.0 million, or 28.2%, from the third quarter of 2024, to 4.3% of loans held for investment (LHFI), driven mostly by downgrades of Commercial Real Estate loans. Four relationships represent over 90% of the net increase in criticized loans. The relationships were largely in the eastern part of the footprint and the downgrades were not broadly driven by industry specific challenges. • Non-performing loans of $141.3 million decreased 19.0% from the third quarter of 2024, reflecting 0.79% of LHFI, driven by the charge-off of the previously disclosed non-performing commercial and industrial loan and the payoff of a $22.2 million agricultural credit, offset by normal migration. Non-performing assets of $145.6 million decreased 18.6% from the third quarter of 2024, reflecting the decrease in non-performing loans. • Net charge-offs (NCOs) were $55.2 million, or an annualized 122 basis points of average loans outstanding during the fourth quarter of 2024, driven by a $49.3 million charge-off on the previously disclosed commercial and industrial loan. Excluding this charge-off, NCOs were 13 basis points of average loans outstanding. • Total provision for credit losses was $33.7 million; funded Allowance for Credit Losses coverage of 1.14% of LHFI during the fourth quarter of 2024 compared to 1.25% from the third quarter of 2024, driven by the release of the previously disclosed $26.5 million specific reserve on the commercial and industrial loan that was partially charged-off. Coverage increased 4 basis points absent the impact of the noted specific reserve release. Capital • Quarterly cash dividend of $0.47 per share, for an annualized yield of 5.8% for the fourth quarter of 2024. • CET13 of 12.16% and total RBC3 of 14.38% for the fourth quarter of 2024. • Regulatory capital ratios improved during the quarter; CET1 improved 33 basis points. FOURTH QUARTER 2024 HIGHLIGHTS 4 1 See non-GAAP table in appendix for reconciliation 2 The ratio of bank non-interest expense to revenue (per FDIC definition) 3 Preliminary estimates - may be subject to change

Loan Highlights: • Loans decreased $182.2 million during the fourth quarter of 2024 driven by declines in most loan categories. • Commercial real estate loans increased due to inflows from completed construction projects; excluding completed construction projects, commercial real estate loans declined as paydowns exceeded new loan originations. • Commercial real estate balances are 33.0% owner-occupied as-of the fourth quarter of 2024. DIVERSIFIED LOAN PORTFOLIO Loans Held for Investment Commercial RE, 52% Construction RE, 7% Residential RE, 12% Agriculture RE, 4% Consumer, 5%Commercial, 16% Agriculture, 4% Loans by Geography MT, 19% WY, 6% ID, 7% WA, 9% OR, 10%NE, 7% SD, 12% ND, 2% IA, 11% KS, 2% AZ, 6% CO, 7% Other, 2% Revolving Commitments ($B) $3.0 $2.9 $2.7 $2.7 $2.6 38.5% 38.6% 41.3% 40.4% 41.9% Unfunded Funded 4Q23 1Q24 2Q24 3Q24 4Q24 5 $17.8B Balances as of December 31, 2024

COMMERCIAL REAL ESTATE AND CONSTRUCTION PORTFOLIOS Property Type Multifamily, 24% Medical, 12% Retail, 20% Industrial/Warehouse, 18% Office, 10%Hotel, 9% Land & Development, 3% Other CRE, 2% Residential 1-4 Family, 2% Market Type Metro, 5% Mid-Metro, 8% Non-Metro, 87% 6 Highlights: • $10.5 billion portfolio (59% of total loans), well diversified by property type and geography • Non-owner-occupied portfolio of $6.2 billion (35% of total loans) • $58.7 million of non-accrual loans (0.56% of commercial real estate and construction portfolios) • Montana has the largest state concentration representing 17% of portfolio Balances as of December 31, 2024 Highlights: • Metro defined as property located in Portland, Seattle, Denver, Phoenix, Minneapolis / St. Paul, and Kansas City. • Mid-metro defined as Omaha, Des Moines, Tuscon, and Boise. • Non-metro defined as all other areas.

Deposits by State MT, 25% WY, 13% ID, 7% WA, 4% OR, 11%SD, 15% NE, 8% IA, 9% MO, 1% AZ, 3% CO, 4% Mix of Consumer and Business Deposits 53% 54% 52% 52% 53% 47% 46% 48% 48% 47% Total Consumer Deposits Total Business Deposits 4Q23 1Q24 2Q24 3Q24 4Q24 7 Average Deposit Balances 27% 27% 27% 27% 28% 33% 34% 34% 34% 34% 14% 13% 13% 13% 12% 26% 26% 26% 26% 26% 1.36% 1.39% 1.42% 1.47% 1.41% Demand Savings Time Non-interest bearing Total Cost of Deposits 4Q23 1Q24 2Q24 3Q24 4Q24 DIVERSE DEPOSIT BASE: BY TYPE OF ACCOUNT Balances as of December 31, 2024 Deposit Highlights: • Total deposits increased $151.5 million from the third quarter of 2024. Customer average balances have generally stabilized, and consumer deposits increased during the quarter. • Non-interest bearing deposits continue to remain stable at 26% of total average deposits.

Total Risk-Based Capital Ratios 13.28% 13.64% 13.80% 14.11% 14.38% 11.08% 11.37% 11.53% 11.83% 12.16% 2.20% 2.27% 2.27% 2.28% 2.23% CET1 Total RBC 4Q23 1Q24 2Q24 3Q24 4Q24² CAPITAL AND LIQUIDITY Liquid and flexible balance sheet with strong capital position Common Equity (CE) and Tangible Common Equity (TCE)¹ $31.05 $30.69 $30.85 $32.20 $31.59 $19.41 $19.16 $19.34 $20.73 $20.16 6.85% 6.92% 6.95% 7.63% 7.55% 10.52% 10.65% 10.65% 11.37% 11.34% TBVPS BVPS TCE Ratio CE Ratio 4Q23 1Q24 2Q24 3Q24 4Q24 8 LHFI to Deposit Ratio 78.4% 79.8% 79.7% 78.8% 77.5% 4Q23 1Q24 2Q24 3Q24 4Q24 1 See Non-GAAP table in appendix for reconciliation 2 Preliminary estimates - may be subject to change Capital and Liquidity Highlights: • Annualized dividend yield of 5.8% based on an average share price of $32.53 for the fourth quarter of 2024. • Capital ratios increased for the eighth consecutive quarter. • Tangible book value per share (TBVPS)1 decreased during the fourth quarter, driven by an increase in the accumulated other comprehensive income (AOCI) position of $67.0 million. For the fourth quarter of 2024, the AOCI mark is equal to $3.08 of book value per share (BVPS).

ALLOWANCE FOR CREDIT LOSSES (ACL) ACL ($MM) and Funded ACL/LHFI Ratio $246.1 $243.1 $238.6 $231.0 $209.3$227.7 $227.7 $232.8 $225.4 $204.1 $18.4 $15.4 $5.8 $5.6 $5.2 1.25% 1.25% 1.28% 1.25% 1.14% Funded ACL Unfunded ACL Funded ACL % of LHFI 4Q23 1Q24 2Q24 3Q24 4Q24 9 ACL Roll-forward ($MM) Funded Unfunded Investments Total ACL 9/30/24 $225.4 $5.6 $0.7 $231.7 ACL Provision (Reversal) 33.9 (0.4) 0.2 33.7 Net Charge-offs 55.2 — — 55.2 ACL 12/31/24 $204.1 $5.2 $0.9 $210.2 * Line items may not sum due to rounding ACL Highlights: • Funded ACL decreased to 1.14% of loans from 1.25% in the prior quarter, driven by the release of the previously disclosed $26.5 million specific reserve on the C&I loan that was partially charged-off. • Coverage increased 4 basis points absent the impact of the noted specific reserve release. • Charge-offs were driven by a $49.3 million charge-off on the previously disclosed C&I loan. Excluding this charge-off, NCOs were 13 basis points of average loans outstanding.

Asset Quality Highlights: • Total criticized loans increased $170.0 million during the fourth quarter of 2024, driven mostly by downgrades of Commercial Real Estate loans. Four relationships represent over 90% of the net increase in criticized loans. The relationships were largely in the eastern part of the footprint and the downgrades were not broadly driven by industry specific challenges. • Total non-performing loans (NPLs) decreased by $33.2 million, or 19.0% during the fourth quarter of 2024 driven by the charge-off of the previously disclosed non-performing C&I loan and the payoff of a $22.2 million agricultural credit, offset by normal migration. • Net charge-offs totaled $55.2 million, or 122 basis points of average loans, during the fourth quarter of 2024; driven by a $49.3 million charge-off on the previously disclosed C&I loan. Excluding this charge-off, NCOs were 13 basis points of average loans outstanding. ASSET QUALITY AND RESERVE TRENDS Net Charge-offs ($MM) and Net Charge-Offs Ratio $4.8 $8.4 $13.5 $27.4 $55.2 0.10% 0.18% 0.30% 0.60% 1.22% Net Charge-offs % of Average Loans 4Q23 1Q24 2Q24 3Q24 4Q24 Total non-performing loans ($MM) and ACL/NPL Ratios $111.3 $175.0 $168.2 $174.5 $141.3 204.6% 130.1% 138.4% 129.2% 144.4% NPLs ACL / NPL Ratio 4Q23 1Q24 2Q24 3Q24 4Q24 Total Criticized Loans ($MM) and Criticized Loan Ratio $688.3 $630.0 $618.0 $603.3 $773.3 3.8% 3.5% 3.4% 3.3% 4.3% Criticized Loans % of Total Loans 4Q23 1Q24 2Q24 3Q24 4Q24 10

Net Interest Income (NII) and Net Interest Margin (NIM) Highlights: • $8.6 million of loan purchase accounting accretion (PAA) for the fourth quarter of 2024, an increase from $4.4 million from the prior quarter. PAA increase was driven by a $3.4 million release related to the pay-off of the previously reported non-accrual agricultural credit. • Total remaining PAA of $44.8 million as-of the fourth quarter of 2024 ◦ Scheduled accretion of $12.9 million, $8.8 million, $6.0 million for FY25, FY26, FY27, respectively. • During the fourth quarter of 2024, FTE NIM1 increased by 16 basis points compared with the prior quarter; the contribution from PAA was 5 basis points • Adjusted FTE NIM1 (which excludes the impact from PAA) increased by 11 basis points during the fourth quarter of 2024, primarily driven by a decline in funding costs. NET INTEREST INCOME FTE NII¹ ($MM) and FTE NIM¹ $204.1 $195.3 $198.3 $202.7 $207.3 $5.4 $6.5 $5.1 $4.4 $8.6 $209.5² $201.8² $203.4² $207.1² $215.9² 3.01% 2.93% 3.00% 3.04% 3.20% 2.94% 2.84% 2.92% 2.97% 3.08% Adjusted FTE NII¹ Loan PAA FTE NIM¹ Adjusted FTE NIM¹ 4Q23 1Q24 2Q24 3Q24 4Q24 11 1 See Non-GAAP table in appendix for reconciliation 2 FTE NII

INVESTMENT PORTFOLIO 12 Total Portfolio Duration at Quarter-end 3.5 3.6 3.5 3.4 3.7 4Q23 1Q24 2Q24 3Q24 4Q24 (in years) Projected Cash Flow ($MM) and Yield Roll-Off at Quarter-end* $168.6 $198.1 $318.8 $205.7 $196.0 $199.5 2.37% 2.36% 2.73% 2.49% 2.36% 2.39% 1Q25E 2Q25E 3Q25E 4Q25E 1Q26E 2Q26E *Constitute forward-looking statements

13 Non-interest Income by Type ¹ Payment Services, 38% Mortgage Banking, 3% Wealth Management, 23% Deposit Service Charges, 14% Other Service Charges & Fees, 5% Other Income, 17% Dollars in millions 4Q23 3Q24 4Q24 Payment services revenues $ 18.4 $ 18.7 $ 17.9 Mortgage banking revenues 1.5 1.7 1.5 Wealth management revenues 8.8 9.6 10.6 Service charges on deposit accounts 6.0 6.6 6.7 Other service charges, commissions and fees 2.5 2.2 2.5 Other income 7.3 7.6 7.8 Total Reported Non-interest Revenue $ 44.5 $ 46.4 $ 47.0 % of Total Revenue 17.6 % 18.4 % 18.0 % NON-INTEREST INCOME Other Income Notes: • Q3 2024 results included a $2.6 million gain-on-sale of property. • Q4 2024 results included a $2.1 million gain-on-sale of property. 1 Balances as of the fourth quarter of 2024

NON-INTEREST EXPENSE 14 Dollars in millions 4Q23 3Q24 4Q24 Salaries and wages $ 64.0 $ 70.9 $ 68.5 Employee benefits 13.5 19.7 20.5 Occupancy and equipment 17.4 17.0 18.2 Other intangible amortization 3.9 3.6 3.6 Other expenses 67.0 48.2 50.0 Other real estate owned expense 0.2 — 0.1 Total Reported Non-interest Expense $ 166.0 $ 159.4 $ 160.9 Non-interest Expense ($MM) and Efficiency Ratio 166.0 160.2 156.9 159.4 160.9 64.2% 64.6% 62.7% 61.8% 60.2% Total Non-interest Expenses Efficiency Ratio ¹ 4Q23 1Q24 2Q24 3Q24 4Q24 1 The ratio of the bank’s non-interest expense to revenue (per FDIC definition) Non-interest Expense Notes: • Q1 2024 results include a $1.5 million accrual for a FDIC special assessment • Q3 2024 results included $3.8 million related to former CEO transition related expenses

Loans and Deposits • Anticipate ending deposits to increase low single digits in 2025, with normal seasonality • Discontinuing Indirect Lending originations in the first quarter; portfolio reflects ~4% of loan balances; annual amortization approximating 30-40% of Indirect balances • Excluding Indirect runoff, modest loan growth in 2025, primarily focused in back-half of year. Net Interest Income • Anticipate full-year net interest income to increase 5-7% in 2025 over 2024 • Outlook assumes one 25 basis point rate decrease in second quarter; rate decreases have minimal impact on outlook Non-Interest Income • Excluding the impact of 2024 gains on sale of property, anticipate 2025 non-interest income to be modestly higher compared to 2024; assumption continues to include muted mortgage activity Non-Interest Expense • Anticipate reported 2025 non-interest expense to increase 3-5% over 2024 due to resetting of certain expenses, including advertising and medical insurance Tax Rate • Anticipate effective tax rate to be 23.5%-24.0% for full-year 2025 Credit Quality • Anticipate net charge-offs between 20 and 30 basis points for the full year 2025 GUIDANCE SUMMARY* 15 *Preliminary estimates - may be subject to change *Constititute forward-looking statements

NON-GAAP FINANCIAL MEASURES 16 In addition to results presented in accordance with accounting principles generally accepted in the United States of America, or GAAP, this presentation contains the following non-GAAP financial measures that management uses to evaluate our performance relative to our capital adequacy standards: (i) tangible common stockholders’ equity; (ii) tangible assets; (iii) tangible book value per common share; (iv) tangible common stockholders’ equity to tangible assets;(v) net interest income on a fully taxable equivalent basis; (vi) adjusted net interest income on a fully taxable equivalent basis; (vii) net interest margin on a fully taxable equivalent basis; and (viii) adjusted net interest margin on a fully taxable equivalent basis. Tangible common stockholders’ equity is calculated as total common stockholders’ equity less goodwill and other intangible assets (excluding mortgage servicing rights). Tangible assets are calculated as total assets less goodwill and other intangible assets (excluding mortgage servicing rights). Tangible book value per common share is calculated as tangible common stockholders’ equity divided by common shares outstanding. Tangible common stockholders’ equity to tangible assets is calculated as tangible common stockholders’ equity divided by tangible assets. Net interest income on a fully taxable equivalent basis is calculated as net interest income, adjusted to include its fully taxable equivalent interest income. Adjusted net interest income on a fully taxable equivalent basis is calculated as net interest income on a fully taxable equivalent basis less purchase accounting interest accretion on acquired loans. Net interest margin on a fully taxable equivalent basis is calculated as annualized net interest income on a fully taxable equivalent basis divided by average interest-earning assets. Adjusted net interest margin on a fully taxable equivalent basis is calculated as annualized adjusted net interest income on a fully taxable equivalent basis divided by average interest-earning assets. These non-GAAP financial measures are calculated on the reconciliation pages that follow). These non-GAAP financial measures may not be comparable to similarly titled measures reported by other companies because other companies may not calculate these non-GAAP measures in the same manner. They also should not be considered in isolation or as a substitute for measures prepared in accordance with GAAP. The Company adjusts the most directly comparable capital adequacy GAAP financial measures to the non-GAAP financial measures described in subclauses (i) through (iv) above to exclude goodwill and other intangible assets (except mortgage servicing rights), adjusts its GAAP net interest income to include fully taxable equivalent adjustments and further adjusts its net interest income on a fully taxable equivalent basis to exclude purchase accounting interest accretion. Management believes these non-GAAP financial measures, which are intended to complement the capital ratios defined by banking regulators and are intended to present on a consistent basis our and our acquired companies’ organic continuing operations without regard to the acquisition costs and adjustments that we consider to be unpredictable and dependent on a significant number of factors that are outside our control, are useful to investors in evaluating the Company’s performance because, as a general matter, they either do not represent an actual cash expense and are inconsistent in amount and frequency depending upon the timing and size of our acquisitions (including the size, complexity and/or volume of past acquisitions, which may drive the magnitude of acquisition related costs, but may not be indicative of the size, complexity and/or volume of future acquisitions or related costs), or they cannot be anticipated or estimated in a particular period (in particular as it relates to unexpected recovery amounts). This impacts the ratios that are important to analysts and allows investors to compare certain aspects of the Company’s capitalization to other companies. See the Non-GAAP Financial Measures tables included below and the textual discussion for a reconciliation of the above described non-GAAP financial measures to their most directly comparable GAAP financial measures.

4Q23 1Q24 2Q24 3Q24 4Q24 (Dollars in millions) Total common stockholders' equity (GAAP) (A) $ 3,227.5 $ 3,209.7 $ 3,225.3 $ 3,365.8 $ 3,304.0 Less goodwill and other intangible assets (excluding mortgage servicing rights) 1,210.3 1,206.6 1,202.9 1,199.3 1,195.7 Tangible common stockholders' equity (Non-GAAP) (B) $ 2,017.2 $ 2,003.1 $ 2,022.4 $ 2,166.5 $ 2,108.3 Total assets (GAAP) $ 30,671.2 $ 30,144.8 $ 30,289.5 $ 29,595.5 $ 29,137.4 Less goodwill and other intangible assets (excluding mortgage servicing rights) 1,210.3 1,206.6 1,202.9 1,199.3 1,195.7 Tangible assets (Non-GAAP) (C) $ 29,460.9 $ 28,938.2 $ 29,086.6 $ 28,396.2 $ 27,941.7 Common shares outstanding (L) 103,942 104,572 104,561 104,530 104,586 Book value per common share (GAAP) (A) / (L) $ 31.05 $ 30.69 $ 30.85 $ 32.20 $ 31.59 Tangible book value per common share (Non-GAAP) (B) / (L) 19.41 19.16 19.34 20.73 20.16 Tangible common stockholders' equity to tangible assets (Non-GAAP) (B) / (C) 6.85 % 6.92 % 6.95 % 7.63 % 7.55 % NON-GAAP RECONCILIATION 17 * Line items may not sum due to rounding

4Q23 1Q24 2Q24 3Q24 4Q24 (Dollars in millions) Net interest income (A) $ 207.8 $ 200.1 $ 201.7 $ 205.5 $ 214.3 FTE adjustments(1) 1.7 1.7 1.7 1.6 1.6 Net interest income on a FTE basis (Non-GAAP) (B) 209.5 201.8 203.4 207.1 215.9 Less purchase accounting accretion 5.4 6.5 5.1 4.4 8.6 Adjusted net interest income on a FTE basis (Non-GAAP) (C) $ 204.1 $ 195.3 $ 198.3 $ 202.7 $ 207.3 Average interest-earning assets (D) $ 27,569.4 $ 27,699.6 $ 27,286.9 $ 27,133.3 $ 26,811.6 Net interest margin (A annualized)/(D) 2.99 % 2.91 % 2.97 % 3.01 % 3.18 % Net interest margin (FTE) (Non-GAAP) (B annualized)/(D) 3.01 2.93 3.00 3.04 3.20 Adjusted net interest margin (FTE) (Non-GAAP) (C annualized)/(D) 2.94 2.84 2.92 2.97 3.08 NON-GAAP RECONCILIATION 18 * Line items may not sum due to rounding 1 Management believes net interest income on a FTE basis is useful to investors in evaluating the Company’s performance as a comparison of the returns between a tax-free investment and a taxable alternative. The Company adjusts its net interest income for tax exempt loans and securities to what it would have received on taxable alternatives utilizing a 21.00% tax rate.

Cover	Jan. 29, 2025
Cover [Abstract]
Document Type	8-K
Document Period End Date	Jan. 29, 2025
Entity Registrant Name	FIRST INTERSTATE BANCSYSTEM, INC.
Entity Incorporation, State or Country Code	DE
Entity File Number	001-34653
Entity Tax Identification Number	81-0331430
Entity Address, Address Line One	401 North 31st Street
Entity Address, City or Town	Billings,
Entity Address, State or Province	MT
Entity Address, Postal Zip Code	59101
City Area Code	(406)
Local Phone Number	255-5311
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Common stock, $0.00001 par value
Trading Symbol	FIBK
Security Exchange Name	NASDAQ
Amendment Flag	false
Entity Central Index Key	0000860413
Entity Emerging Growth Company	false

First Interstate BancSys... (NASDAQ:FIBK)
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First Interstate BancSys... (NASDAQ:FIBK)
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