Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of Commitments to Extend Credit [Table Text Block]

		June 30, 2013		December 31, 2012		June 30, 2012
Loan Commitments
	Commercial	$	3,020,138	$	2,431,023	$	2,227,184
	Consumer	2,096,495		1,720,518		1,665,681
	Total loan commitments	$	5,116,633	$	4,151,541	$	3,892,865

Schedule of Guarantor Obligations [Table Text Block]

		June 30, 2013		December 31, 2012		June 30, 2012
Financial guarantees
	Standby letters of credit	$	243,787	$	136,202	$	138,260
	Loans sold with recourse	54,944		42,383		28,544
	Total financial guarantees	$	298,731	$	178,585	$	166,804

Changes in Repurchase Reserve [Table Text Block]

Changes in the amount of the repurchase reserve for the three and six months ended June 30, 2013 and 2012 are as follows:

	Three months ended June 30, 2013
	Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchase reserve
Balance at beginning of period	$	1,600		$	1,138		$	2,738
Assumed obligation	6,000			—			6,000
Net realized losses	(928		)	—			(928		)
Net increase (decrease) to reserve	615			(32		)	583
Balance at end of period	$	7,287		$	1,106		$	8,393

	Three months ended June 30, 2012
	Reserve on residential mortgage loans			Reserve on manufactured housing loans			Total repurchased reserve
Balance at beginning of period	$	400		$	1,278		$	1,678
Net realized losses	(161		)	—			(161		)
Net increase (decrease) to reserve	511			(15		)	496
Balance at end of period	$	750		$	1,263		$	2,013

	Six months ended June 30, 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
Assumed obligation	6,000			—			6,000
Net realized losses	(1,070		)	—			(1,070		)
Net increase (decrease) to reserve	857			(61		)	796
Balance at end of period	$	7,287		$	1,106		$	8,393

	Six months ended June 30, 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	(367		)	—			(367		)
Net increase (decrease) to reserve	647			(10		)	637
Balance at end of period	$	750		$	1,263		$	2,013