Commitments and Contingencies (Details) (USD $)											6 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2014 Commitments to Extend Credit	Dec. 31, 2013 Commitments to Extend Credit	Jun. 30, 2014 Standby Letters of Credit	Dec. 31, 2013 Standby Letters of Credit	Jun. 30, 2014 Recourse Obligation on Mortgage Loans Sold	Jun. 30, 2014 Obligation to Repurchase Receivables Sold	Dec. 31, 2013 Obligation to Repurchase Receivables Sold
Guarantor Obligations [Line Items]
Unused commitments							$ 6,200,000,000	$ 5,840,000,000
Guarantor obligations amount									61,400,000	54,800,000
Reserve for estimated losses arising from repurchase of loans												3,300,000	3,600,000
FDIC Indemnification Asset	49,959,000	74,784,000	93,397,000	158,013,000	195,942,000	270,192,000
Recourse Period, Maximum1											120 days
FDIC loss share payable	$ 114,281,000		$ 109,378,000