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Condensed Financial Information (Parent Company Only) | 12 Months Ended
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Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract] |
Condensed Financial Information (Parent Company Only) | CONDENSED FINANCIAL INFORMATION (PARENT COMPANY ONLY) Following is condensed financial information of First Interstate BancSystem, Inc.
December 31, | 2023 |  | 2022
Condensed balance sheets: |  |  |
Cash and cash equivalents | $ | 275.7 |  |  | $ | 154.8 |
Investment in bank subsidiary | 3,062.2 |  |  | 2,985.8 |
Advances to subsidiaries, net | 43.5 |  |  | 0.1 |
Other assets | 147.0 |  |  | 240.7 |
Total assets | $ | 3,528.4 |  |  | $ | 3,381.4 |
Other liabilities | $ | 38.8 |  |  | $ | 45.6 |
Long-term debt | 99.0 |  |  | 98.9 |
Subordinated debentures held by subsidiary trusts | 163.1 |  |  | 163.1 |
Total liabilities | 300.9 |  |  | 307.6 |
Stockholders’ equity | 3,227.5 |  |  | 3,073.8 |
Total liabilities and stockholders’ equity | $ | 3,528.4 |  |  | $ | 3,381.4 |
Years Ended December 31, | 2023 |  | 2022 |  | 2021
Condensed statements of income: |  |  |  |  |
Dividends from subsidiaries | $ | 360.0 |  |  | $ | 360.0 |  |  | $ | 160.0 |
Other interest income | 0.5 |  |  | 0.4 |  |  | — |
Other income, primarily management fees from subsidiaries | 51.6 |  |  | 51.7 |  |  | 41.3 |
Total income | 412.1 |  |  | 412.1 |  |  | 201.3 |
Salaries and benefits | 34.5 |  |  | 40.6 |  |  | 36.4 |
Interest expense | 18.4 |  |  | 12.6 |  |  | 8.2 |
Acquisition related expenses | — |  |  | 62.3 |  |  | 11.6 |
Other operating expenses, net | 22.5 |  |  | 25.0 |  |  | 17.6 |
Total expenses | 75.4 |  |  | 140.5 |  |  | 73.8 |
Earnings before income tax benefit | 336.7 |  |  | 271.6 |  |  | 127.5 |
Income tax benefit | (4.2) |  |  | (18.9) |  |  | (7.6) |
Income before undistributed earnings of subsidiaries | 340.9 |  |  | 290.5 |  |  | 135.1 |
Undistributed (loss) earnings of subsidiaries | (83.4) |  |  | (88.3) |  |  | 57.0 |
Net income | $ | 257.5 |  |  | $ | 202.2 |  |  | $ | 192.1 |
Years Ended December 31, | 2023 |  | 2022 |  | 2021
Condensed statements of cash flows: |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |
Net income | $ | 257.5 |  |  | $ | 202.2 |  |  | $ | 192.1 |
Adjustments to reconcile net income to cash provided by operating activities: |  |  |  |  |
Undistributed losses (earnings) of subsidiaries | 83.4 |  |  | 88.3 |  |  | (57.0) |
Stock-based compensation expense | 4.6 |  |  | 9.6 |  |  | 8.9 |
Other, net | 2.7 |  |  | (151.2) |  |  | (3.2) |
Net cash provided by operating activities | 348.2 |  |  | 148.9 |  |  | 140.8 |
Cash flows from investing activities: |  |  |  |  |
Acquisition of bank holding company, net of cash and cash equivalents received | — |  |  | (0.8) |  |  | — |
Net cash used in investing activities | $ | — |  |  | $ | (0.8) |  |  | $ | — |
Years Ended December 31, | 2023 |  | 2022 |  | 2021
Cash flows from financing activities: |  |  |  |  |
Net increase in advances from subsidiaries | $ | 1.8 |  |  | $ | 206.5 |  |  | $ | 23.7 |
Proceeds from issuance of common stock, net of stock issuance costs | — |  |  | 0.1 |  |  | 0.4 |
Purchase and retirement of common stock | (34.0) |  |  | (198.9) |  |  | (5.4) |
Dividends paid to common stockholders | (195.1) |  |  | (182.1) |  |  | (101.6) |
Net cash used in financing activities | (227.3) |  |  | (174.4) |  |  | (82.9) |
Net change in cash and cash equivalents | 120.9 |  |  | (26.3) |  |  | 57.9 |
Cash and cash equivalents, beginning of year | 154.8 |  |  | 181.1 |  |  | 123.2 |
Cash and cash equivalents, end of year | $ | 275.7 |  |  | $ | 154.8 |  |  | $ | 181.1 |
There was $1,722.5 million of noncash financing activities for the issuance of common stock related to the GWB acquisition in 2022.

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- Definition The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 205 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04(Schedule I)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480922/205-10-S99-6 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Topic 810 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481231/810-10-45-11 + Details
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