Operating Segment Information (Tables)

6 Months Ended

Jun. 30, 2011

Operating Segment Information [Abstract]

Financial data for the Company's operating segments

	At or for the Three Months ended June 30, 2011
				Mountain			First															First Bank-
(Dollars in thousands)	Glacier			West			Security			Western			1st Bank			Valley			Big Sky			WY
External revenues	$	17,936			17,682			13,510			8,851			8,089			5,471			4,753			3,850
Intersegment revenues		74			97			19			24			9			67			4			29
Expenses		(16,198	)		(19,764	)		(10,059	)		(6,356	)		(6,119	)		(3,751	)		(3,740	)		(2,980	)
Net earnings (loss)	$	1,812			(1,985	)		3,470			2,519			1,979			1,787			1,017			899
Total assets	$	1,379,298			1,152,583			1,082,737			778,081			756,704			411,619			373,530			373,014

				First Bank-			San
	Citizens			MT			Juans			GORE			Parent			Eliminations			Consolidated
External revenues	$	3,704			2,544			2,610			219			194			—			89,413
Intersegment revenues		12			39			42			—			16,473			(16,889	)		—
Expenses		(2,980	)		(1,639	)		(2,393	)		(801	)		(4,806	)		4,059			(77,527	)
Net earnings (loss)	$	736			944			259			(582	)		11,861			(12,830	)		11,886
Total assets	$	317,280			243,141			226,032			20,318			1,009,907			(1,145,924	)		6,978,320

	At or for the Three Months ended June 30, 2010
				Mountain			First															First Bank-
(Dollars in thousands)	Glacier			West			Security			Western			1st Bank			Valley			Big Sky			WY
External revenues	$	18,969			22,183			13,097			8,811			7,753			5,798			5,099			3,659
Intersegment revenues		48			19			20			123			30			40			1			14
Expenses		(16,407	)		(21,759	)		(10,057	)		(6,686	)		(6,919	)		(3,921	)		(4,397	)		(3,180	)
Net earnings (loss)	$	2,610			443			3,060			2,248			864			1,917			703			493
Total assets	$	1,320,555			1,200,382			932,179			610,208			644,877			368,321			366,439			295,164

				First Bank-			San
	Citizens			MT			Juans			GORE			Parent			Eliminations			Consolidated
External revenues	$	4,608			2,472			2,688			43			56			—			95,236
Intersegment revenues		28			32			24			—			17,885			(18,264	)		—
Expenses		(3,842	)		(1,705	)		(2,135	)		(268	)		(4,719	)		3,981			(82,014	)
Net earnings (loss)	$	794			799			577			(225	)		13,222			(14,283	)		13,222
Total assets	$	271,190			193,806			204,815			19,856			985,895			(1,118,851	)		6,294,836

	At or for the Six Months ended June 30, 2011
				Mountain			First															First Bank-
(Dollars in thousands)	Glacier			West			Security			Western			1st Bank			Valley			Big Sky			WY
External revenues	$	35,270			35,151			26,167			17,045			15,702			10,440			9,494			7,111
Intersegment revenues		140			239			39			79			12			126			7			64
Expenses		(31,239	)		(38,273	)		(20,773	)		(12,661	)		(12,634	)		(7,244	)		(7,522	)		(5,733	)
Net earnings (loss)	$	4,171			(2,883	)		5,433			4,463			3,080			3,322			1,979			1,442
Total assets	$	1,379,298			1,152,583			1,082,737			778,081			756,704			411,619			373,530			373,014

				First Bank-			San												Total
	Citizens			MT			Juans			GORE			Parent			Eliminations			Consolidated
External revenues	$	7,860			4,858			5,239			249			595			—			175,181
Intersegment revenues		30			74			86			—			31,159			(32,055	)		—
Expenses		(6,563	)		(3,120	)		(4,603	)		(1,125	)		(9,668	)		8,148			(153,010	)
Net earnings (loss)	$	1,327			1,812			722			(876	)		22,086			(23,907	)		22,171
Total assets	$	317,280			243,141			226,032			20,318			1,009,907			(1,145,924	)		6,978,320

	At or for the Six Months ended June 30, 2010
				Mountain			First															First Bank-
(Dollars in thousands)	Glacier			West			Security			Western			1st Bank			Valley			Big Sky			WY
External revenues	$	37,704			41,133			25,653			16,939			15,729			10,890			9,935			7,699
Intersegment revenues		96			38			38			255			121			76			1			22
Expenses		(34,142	)		(40,243	)		(20,217	)		(13,003	)		(13,420	)		(7,552	)		(8,901	)		(6,856	)
Net earnings (loss)	$	3,658			928			5,474			4,191			2,430			3,414			1,035			865
Total assets	$	1,320,555			1,200,382			932,179			610,208			644,877			368,321			366,439			295,164

				First Bank-			San												Total
	Citizens			MT			Juans			GORE			Parent			Eliminations			Consolidated
External revenues	$	8,756			4,892			5,325			43			119			—			184,817
Intersegment revenues		28			82			24			—			32,521			(33,302	)		—
Expenses		(7,412	)		(3,396	)		(4,596	)		(268	)		(9,348	)		7,829			(161,525	)
Net earnings (loss)	$	1,372			1,578			753			(225	)		23,292			(25,473	)		23,292
Total assets	$	271,190			193,806			204,815			19,856			985,895			(1,118,851	)		6,294,836