Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of commitments to extend credit [Table Text Block]

The following table shows the remaining contractual amount of each class of commitments to extend credit as of December 31, 2013 and 2012. This amount represents the Corporation's maximum exposure to loss if the customer were to draw upon the full amount of the commitment and subsequently default on payment for the total amount of the then outstanding loan.

		At December 31,
		2013		2012
Loan Commitments
	Commercial	$	3,367,625	$	2,431,023
	Consumer	2,179,010		1,720,518
	Total loan commitments	$	5,546,635	$	4,151,541

Schedule of Future Minimum Rental Payments for Operating Leases

The Corporation is obligated under various noncancelable operating leases on branch offices. Minimum future rental payments under noncancelable operating leases at December 31, 2013 are as follows:

Year Ended December 31,	Lease Commitments
2014	$	14,018
2015	11,871
2016	9,725
2017	8,421
2018	7,007
2019-2028	19,063
	$	70,105

Schedule of Guarantor Obligations

The Corporation is a guarantor in certain agreements with third parties. The following table shows the types of guarantees the Corporation had outstanding as of December 31, 2013 and 2012.

		At December 31,
		2013		2012
Financial guarantees
	Standby letters of credit	$	196,400	$	136,202
	Loans sold with recourse	45,082		42,383
	Total financial guarantees	$	241,482	$	178,585

Changes in Repurchase Reserve

Changes in the amount of the repurchase reserve for the years ended December 31, 2013 and 2012 are as follows:

	Year Ended December 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
Assumed Obligation	6,000			—			6,000
Net realized losses	(5,770		)	—			(5,770		)
Net increase (decrease) to reserve	7,007			(53		)	6,954
Balance at end of period	$	8,737		$	1,114		$	9,851

	Year ended December 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	(863		)	—			(863		)
Net increase (decrease) to reserve	1,893			(106		)	1,787
Balance at end of period	$	1,500		$	1,167		$	2,667