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Condensed Financial Information (Parent Company Only) | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information of Parent Company Only 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, | 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 |
During 2017, there was $386.0 million of noncash financing activities for the issuance of common stock for the BOTC acquisition. There were no noncash investing or financing activities during 2016 or 2015.

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.7-05(c)(Schedule II)) -URI http://asc.fasb.org/extlink&oid=6879921&loc=d3e569147-122900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96868048&loc=d3e5283-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04(c)(Schedule I)) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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