Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

	Commercial		Retail		Wealth		Total
Balance at December 31, 2009	$	73,827	$	59,038	$	6,733	$	139,598
Goodwill acquired:
First Bank branches	46,414		1,933		—		48,347
Midwest	264,480		5,170		2,449		272,099
Balance at December 31, 2010	384,721		66,141		9,182		460,044
Balance at December 31, 2011	$	384,721	$	66,141	$	9,182	$	460,044

Accumulated amortization of intangible assets

	December 31, 2011
	Gross Carrying		Accumulated			Net Carrying
	Amount		Amortization			Amount
Core deposit intangibles	$	16,759	$	(8,829	)	$	7,930
Non-compete covenant	102		(51		)	51
Lease intangible	618		(360		)	258
	$	17,479	$	(9,240	)	$	8,239
	December 31, 2010
	Gross Carrying		Accumulated			Net Carrying
	Amount		Amortization			Amount
Core deposit intangibles	$	16,760	$	(6,871	)	$	9,889
Non-compete covenant	102		(25		)	77
Lease intangible	617		(172		)	445
	$	17,479	$	(7,068	)	$	10,411

Schedule of Expected Amortization Expense

For the years ended:
December 31, 2012	$	1,867
December 31, 2013	1,226
December 31, 2014	1,073
December 31, 2015	984
December 31, 2016	895
	$	6,045