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Condensed Financial Information (Parent Company Only) (Tables) | 12 Months Ended
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Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract] |
Schedule of Condensed Financial Statements | 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 |

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- Definition Tabular disclosure of condensed financial statements, including, but not limited to, the balance sheet, income statement, and statement of cash flows. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 04 -Paragraph (a) -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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