Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Guarantor Obligations [Line Items]
Payable to FDIC for loss share agreements	$ 109,378,000	$ 101,641,000
Commitments to Extend Credit
Guarantor Obligations [Line Items]
Unused commitments	5,840,000,000	5,470,000,000
Standby Letters of Credit
Guarantor Obligations [Line Items]
Guarantor obligations amount	54,811,000	63,085,000
Recourse Obligation on Mortgage Loans Sold
Guarantor Obligations [Line Items]
Guarantor obligations amount	156,079,000	205,888,000
Recourse Period, Maximum1	120 days
Obligation to Repurchase Receivables Sold
Guarantor Obligations [Line Items]
Reserve for estimated losses arising from repurchase of loans	$ 3,641,000	$ 4,065,000