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Condensed Financial Information (Parent Company Only) (Tables) | 12 Months Ended
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Dec. 31, 2021
Condensed Financial Information Disclosure [Abstract] |
Schedule of Condensed Financial Statements | Following is condensed financial information of First Interstate BancSystem, Inc.
December 31, | 2021 |  | 2020
Condensed balance sheets: |  |  |
Cash and cash equivalents | $ | 181.1 |  |  | $ | 123.2 |
Investment in bank subsidiary | 1,948.9 |  |  | 1,986.6 |
Advances to subsidiaries, net | 5.9 |  |  | 41.0 |
Other assets | 63.2 |  |  | 61.3 |
Total assets | $ | 2,199.1 |  |  | $ | 2,212.1 |
Other liabilities | $ | 26.8 |  |  | $ | 66.7 |
Long-term debt | 98.7 |  |  | 98.6 |
Subordinated debentures held by subsidiary trusts | 87.0 |  |  | 87.0 |
Total liabilities | 212.5 |  |  | 252.3 |
Stockholders’ equity | 1,986.6 |  |  | 1,959.8 |
Total liabilities and stockholders’ equity | $ | 2,199.1 |  |  | $ | 2,212.1 |
Years Ended December 31, | 2021 |  | 2020 |  | 2019
Condensed statements of income: |  |  |  |  |
Dividends from subsidiaries | $ | 160.0 |  |  | $ | 130.0 |  |  | $ | 178.0 |
Other interest income | — |  |  | 0.1 |  |  | 0.3 |
Other income, primarily management fees from subsidiaries | 41.3 |  |  | 28.7 |  |  | 25.9 |
Total income | 201.3 |  |  | 158.8 |  |  | 204.2 |
Salaries and benefits | 36.4 |  |  | 31.5 |  |  | 34.2 |
Interest expense | 8.2 |  |  | 6.6 |  |  | 4.7 |
Acquisition related expenses | 11.6 |  |  | — |  |  | 17.0 |
Other operating expenses, net | 17.6 |  |  | 15.6 |  |  | 14.8 |
Total expenses | 73.8 |  |  | 53.7 |  |  | 70.7 |
Earnings before income tax benefit | 127.5 |  |  | 105.1 |  |  | 133.5 |
Income tax benefit | (7.6) |  |  | (6.1) |  |  | (11.9) |
Income before undistributed earnings of subsidiaries | 135.1 |  |  | 111.2 |  |  | 145.4 |
Undistributed earnings of subsidiaries | 57.0 |  |  | 50.0 |  |  | 35.6 |
Net income | $ | 192.1 |  |  | $ | 161.2 |  |  | $ | 181.0 |
Years Ended December 31, | 2021 |  | 2020 |  | 2019
Condensed statements of cash flows: |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |
Net income | $ | 192.1 |  |  | $ | 161.2 |  |  | $ | 181.0 |
Adjustments to reconcile net income to cash provided by operating activities: |  |  |  |  |
Undistributed earnings of subsidiaries | (57.0) |  |  | (50.0) |  |  | (35.6) |
Stock-based compensation expense | 8.9 |  |  | 7.5 |  |  | 8.0 |
Other, net | (3.2) |  |  | (13.6) |  |  | 8.1 |
Net cash provided by operating activities | 140.8 |  |  | 105.1 |  |  | 161.5 |
Cash flows from financing activities: |  |  |  |  |
Net (decrease) increase in advances from subsidiaries | 23.7 |  |  | 16.7 |  |  | (6.6) |
Proceeds from issuance of long-term debt | — |  |  | 98.6 |  |  | — |
Proceeds from issuance of common stock, net of stock issuance costs | 0.4 |  |  | 1.1 |  |  | 1.0 |
Purchase and retirement of common stock | (5.4) |  |  | (116.8) |  |  | (2.5) |
Dividends paid to common stockholders | (101.6) |  |  | (128.6) |  |  | (79.2) |
Net cash used in financing activities | (82.9) |  |  | (129.0) |  |  | (87.3) |
Net change in cash and cash equivalents | 57.9 |  |  | (23.9) |  |  | 74.2 |
Cash and cash equivalents, beginning of year | 123.2 |  |  | 147.1 |  |  | 72.9 |
Cash and cash equivalents, end of year | $ | 181.1 |  |  | $ | 123.2 |  |  | $ | 147.1 |

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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/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 3 -Paragraph i -Subsection 10 + Details
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