Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of Commitments to Extend Credit [Table Text Block]

		March 31, 2013		December 31, 2012		March 31, 2012
Loan Commitments
	Commercial	$	2,317,997	$	2,431,023	$	2,534,452
	Consumer	1,750,913		1,720,518		1,624,660
	Total loan commitments	$	4,068,910	$	4,151,541	$	4,159,112

Schedule of Guarantor Obligations [Table Text Block]

		March 31, 2013		December 31, 2012		March 31, 2012
Financial guarantees
	Standby letters of credit	$	120,508	$	136,202	$	132,216
	Loans sold with recourse	44,672		42,383		27,886
	Total financial guarantees	$	165,180	$	178,585	$	160,102

Changes in Repurchase Reserve [Table Text Block]

Changes in the amount of the repurchase reserve for the three months ended March 31, 2013 and 2012 are as follows:

	Three months ended March 31, 2013
	Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchased reserve
Balance at beginning of period	$	1,500		$	1,167		$	2,667
Net realized losses	(56		)	—			(56		)
Net increase (decrease) to reserve	156			(29		)	127
Balance at end of period	$	1,600		$	1,138		$	2,738

	Three months ended March 31, 2012
	Reserve on residential mortgage loans			Reserve on manufactured housing loans		Total repurchased reserve
Balance at beginning of period	$	470		$	1,273	$	1,743
Net realized losses	(206		)	—		(206		)
Net increase (decrease) to reserve	136			5		141
Balance at end of period	$	400		$	1,278	$	1,678