Commitments and Contingencies (Details) (USD $)							3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Commitments to Extend Credit	Dec. 31, 2013 Commitments to Extend Credit	Mar. 31, 2014 Standby Letters of Credit	Dec. 31, 2013 Standby Letters of Credit	Mar. 31, 2014 Recourse Obligation on Mortgage Loans Sold	Mar. 31, 2014 Obligation to Repurchase Receivables Sold
Guarantor Obligations [Line Items]
Unused commitments			$ 6,110,000,000	$ 5,840,000,000
Guarantor obligations amount					52,300,000	54,800,000
Reserve for estimated losses arising from repurchase of loans								3,600,000
FDIC Indemnification Asset	74,784,000	93,397,000
Recourse Period, Maximum1							120 days
FDIC loss share payable	$ 111,339,000	$ 109,378,000