Condensed Financial Information (Parent Company Only)

12 Months Ended

Dec. 31, 2011

Condensed Financial Information (Parent Company Only) [Abstract]

Condensed Financial Information of Parent Company Only Disclosure [Text Block]

CONDENSED FINANCIAL INFORMATION (PARENT COMPANY ONLY)

Following is condensed financial information of First Interstate BancSystem, Inc.

December 31,	2011		2010
Condensed balance sheets:
Cash and cash equivalents	$	131,860	$	133,277
Investment in subsidiaries, at equity:
Bank subsidiaries	775,026		740,006
Nonbank subsidiaries	1,973		1,975
Total investment in subsidiaries	776,999		741,981
Other assets	27,569		27,010
Total assets	$	936,428	$	902,268
Other liabilities	$	19,552	$	16,697
Advances from subsidiaries, net	2,141		5,054
Long-term debt	20,000		20,000
Subordinated debentures held by subsidiary trusts	123,715		123,715
Total liabilities	165,408		165,466
Stockholders’ equity	771,020		736,802
Total liabilities and stockholders’ equity	$	936,428	$	902,268

Years Ended December 31,	2011			2010			2009
Condensed statements of income:
Dividends from subsidiaries	$	30,000		$	15,400		$	41,900
Other interest income	118			105			9
Other income, primarily management fees from subsidiaries	10,617			11,336			11,529
Total income	40,735			26,841			53,438
Salaries and benefits	13,975			13,435			12,687
Interest expense	7,273			7,703			8,773
Other operating expenses, net	6,903			6,827			6,270
Total expenses	28,151			27,965			27,730
Earnings before income tax benefit	12,584			(1,124		)	25,708
Income tax expense (benefit)	(6,518		)	(6,254		)	(6,261		)
Income before undistributed earnings of subsidiaries	19,102			5,130			31,969
Undistributed earnings of subsidiaries	25,444			32,226			21,894
Net income	$	44,546		$	37,356		$	53,863

Years Ended December 31,	2011			2010			2009
Condensed statements of cash flows:
Cash flows from operating activities:
Net income	$	44,546		$	37,356		$	53,863
Adjustments to reconcile net income to cash provided by operating activities:
Undistributed earnings of subsidiaries	(25,444		)	(32,226		)	(21,894		)
Depreciation and amortization	85			217			241
Write-down of equipment pending sale	—			—			350
Deferred income tax expense (benefit)	23			(1,455		)	(1,401		)
Stock-based compensation expense	2,111			1,764			1,067
Tax benefits from stock-based compensation	204			239			742
Excess tax benefits from stock-based compensation	(124		)	(225		)	(719		)
Other, net	2,492			(3,087		)	(8,664		)
Net cash provided by operating activities	23,893			2,583			23,585
Cash flows from investing activities:
Capitalization of subsidiaries	—			(130		)	(535		)
Capital expenditures	(3		)	—			—
Net cash used in investing activities	(3		)	(130		)	(535		)
Cash flows from financing activities:
Net (decrease) increase in advances from nonbank subsidiaries	(2,913		)	5,002			(4,718		)
Repayments of long-term debt	—			(33,929		)	(8,928		)
Debt issuance costs	—			—			(261		)
Proceeds from issuance of common stock	385			167,400			3,914
Common stock issuance costs	—			(13,597		)	—
Excess tax benefits from stock-based compensation	124			225			719
Purchase and retirement of common stock	(248		)	(3,699		)	(11,052		)
Dividends paid to common stockholders	(19,233		)	(17,905		)	(15,694		)
Dividends paid to preferred stockholders	(3,422		)	(3,422		)	(3,422		)
Net cash provided by (used in) financing activities	(25,307		)	100,075			(39,442		)
Net change in cash and cash equivalents	(1,417		)	102,528			(16,392		)
Cash and cash equivalents, beginning of year	133,277			30,749			47,141
Cash and cash equivalents, end of year	$	131,860		$	133,277		$	30,749

Noncash Investing and Financing Activities — The Company transferred accrued liabilities of $216 and $59 to common stock in conjunction with the vesting of liability-classified non-vested stock awards during 2011 and 2010, respectively.

During 2009, the Company settled an intercompany payable to a nonbank subsidiary through investment in subsidiary. The settlement resulted in a decrease in advances from subsidiary of $581 and a corresponding decrease in investment in subsidiary.

During 2009, the Company transferred equipment pending disposal of $1,519 to other assets.