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Condensed Financial Information (Parent Company Only) (Tables) | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Schedule of Condensed Financial Statements | Following is condensed financial information of First Interstate BancSystem, Inc.
December 31, | 2017 |  | 2016
Condensed balance sheets: |  |  |
Cash and cash equivalents | $ | 42.3 |  |  | $ | 138.4 |
Investment in subsidiaries, at equity: |  |  |
Bank subsidiary | 1,432.3 |  |  | 932.0 |
Total investment in subsidiaries | 1,432.3 |  |  | 932.0 |
Advances to subsidiaries, net | 25.7 |  |  | — |
Other assets | 61.7 |  |  | 35.4 |
Total assets | $ | 1,562.0 |  |  | $ | 1,105.8 |
Other liabilities | $ | 51.9 |  |  | $ | 18.0 |
Advances from subsidiaries, net | — |  |  | 2.7 |
Long-term debt | — |  |  | 20.0 |
Subordinated debentures held by subsidiary trusts | 82.5 |  |  | 82.5 |
Total liabilities | 134.4 |  |  | 123.2 |
Stockholders’ equity | 1,427.6 |  |  | 982.6 |
Total liabilities and stockholders’ equity | $ | 1,562.0 |  |  | $ | 1,105.8 |
Years Ended December 31, | 2017 |  | 2016 |  | 2015
Condensed statements of income: |  |  |  |  |
Dividends from subsidiaries | $ | 150.0 |  |  | $ | 140.0 |  |  | $ | 70.0 |
Other interest income | 0.1 |  |  | — |  |  | — |
Other income, primarily management fees from subsidiaries | 18.0 |  |  | 15.1 |  |  | 13.2 |
Total income | 168.1 |  |  | 155.1 |  |  | 83.2 |
Salaries and benefits | 21.8 |  |  | 18.8 |  |  | 16.3 |
Interest expense | 4.7 |  |  | 4.1 |  |  | 3.8 |
Acquisition expenses | 25.3 |  |  | 1.5 |  |  | 0.8 |
Other operating expenses, net | 13.0 |  |  | 10.4 |  |  | 9.9 |
Total expenses | 64.8 |  |  | 34.8 |  |  | 30.8 |
Earnings before income tax benefit | 103.3 |  |  | 120.3 |  |  | 52.4 |
Income tax benefit | (14.2 | ) |  | (7.7 | ) |  | (7.0 | )
Income before undistributed earnings of subsidiaries | 117.5 |  |  | 128.0 |  |  | 59.4 |
Undistributed earnings of subsidiaries | (11.0 | ) |  | (32.4 | ) |  | 27.4 |
Net income | $ | 106.5 |  |  | $ | 95.6 |  |  | $ | 86.8 |
Years Ended December 31, | 2017 |  | 2016 |  | 2015
Condensed statements of cash flows: |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |
Net income | $ | 106.5 |  |  | $ | 95.6 |  |  | $ | 86.8 |
Adjustments to reconcile net income to cash provided by operating activities: |  |  |  |  |
Undistributed earnings of subsidiaries | 11.0 |  |  | 32.4 |  |  | (27.4 | )
Stock-based compensation expense | 3.9 |  |  | 4.4 |  |  | 3.9 |
Tax benefits from stock-based compensation | — |  |  | 2.1 |  |  | 1.4 |
Excess tax benefits from stock-based compensation | — |  |  | (1.6 | ) |  | (1.2 | )
Other, net | 14.7 |  |  | (0.8 | ) |  | (11.3 | )
Net cash provided by operating activities | 136.1 |  |  | 132.1 |  |  | 52.2 |
Cash flows from investing activities: |  |  |  |  |
Capital distributions from nonbank subsidiaries | 18.0 |  |  | 2.0 |  |  | — |
Acquisition of intangible assets | (28.0 | ) |  | — |  |  | — |
Acquisition of bank holding company, net of cash and cash equivalents received | (128.3 | ) |  | — |  |  | (7.2 | )
Investment in subsidiary | (18.0 | ) |  | — |  |  | — |
Net cash used in investing activities | $ | (156.3 | ) |  | $ | 2.0 |  |  | $ | (7.2 | )
Years Ended December 31, | 2017 |  | 2016 |  | 2015
Cash flows from financing activities: |  |  |  |  |
Net (decrease) increase in advances from nonbank subsidiaries | $ | (28.4 | ) |  | $ | 9.1 |  |  | $ | (2.0 | )
Repayment of long-term debt | — |  |  | — |  |  | (1.0 | )
Proceeds from issuance of common stock, net of stock issuance costs | 2.4 |  |  | 4.7 |  |  | 3.4 |
Excess tax benefits from stock-based compensation | — |  |  | 1.6 |  |  | 1.2 |
Purchase and retirement of common stock | (1.3 | ) |  | (26.9 | ) |  | (20.6 | )
Dividends paid to common stockholders | (48.6 | ) |  | (39.4 | ) |  | (36.3 | )
Net cash used in financing activities | (75.9 | ) |  | (50.9 | ) |  | (55.3 | )
Net change in cash and cash equivalents | (96.1 | ) |  | 83.2 |  |  | (10.3 | )
Cash and cash equivalents, beginning of year | 138.4 |  |  | 55.2 |  |  | 65.5 |
Cash and cash equivalents, end of year | $ | 42.3 |  |  | $ | 138.4 |  |  | $ | 55.2 |

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