Allowance for Loan and Lease Losses (Tables)

12 Months Ended

Dec. 31, 2012

Allowance for Loan and Lease Losses, Provision for Loss, Net [Abstract]

Allowance for Credit Losses on Financing Receivables

Changes in the allowance for loan and lease losses for the years ended December 31, 2012, 2011, and 2010 were as follows, in thousands:

	2012			2011			2010
Balance at beginning of year	$	36,808		$	42,693		$	41,848
Provision for loan and lease losses	8,202			29,365			32,508
Recoveries on loans and leases previously charged-off	8,209			4,730			2,387
Loans and leases charged-off	(14,504		)	(39,980		)	(34,050		)
Balance at end of year	$	38,715		$	36,808		$	42,693

Changes in the allowance for loan and lease losses by loan category for the years ended December 31, 2012 and December 31, 2011, were as follows, in thousands:

	Commercial			Commercial Real Estate			Agricultural			Residential Real Estate			Consumer			Leases			Unallocated		Total
Balance at December 31, 2011	$	10,547		$	14,621		$	1,763		$	3,001		$	6,874		$	2		$	—	$	36,808
Charge-offs	(1,799		)	(6,898		)	(1		)	(988		)	(4,818		)	—			—		(14,504		)
Recoveries	1,966			5,194			81			164			804			—			—		8,209
Provision	674			1,556			295			1,366			4,313			(2		)	—		8,202
Balance at December 31, 2012	$	11,388		$	14,473		$	2,138		$	3,543		$	7,173		$	—		$	—	$	38,715

	Commercial			Commercial Real Estate			Agricultural			Residential Real Estate			Consumer			Leases			Unallocated			Total
Balance at December 31, 2010	$	10,525		$	20,316		$	2,147		$	2,381		$	6,315		$	9		$	1,000		$	42,693
Charge-offs	(2,970		)	(29,504		)	(167		)	(1,878		)	(5,461		)	—			—			(39,980		)
Recoveries	1,051			2,868			33			46			732			—			—			4,730
Provision	1,941			20,941			(250		)	2,452			5,288			(7		)	(1,000		)	29,365
Balance at December 31, 2011	$	10,547		$	14,621		$	1,763		$	3,001		$	6,874		$	2		$	—		$	36,808