Commitments and Contingencies (Details) (USD $)	12 Months Ended				108 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Loss Contingencies [Line Items]
Loan commitments and letters of credit	$ 25,000,000				$ 25,000,000
Contractual amount net of risk participations	116,000,000				116,000,000
Operating Leases, Future Minimum Payments Due [Abstract]
2014	23,776,000				23,776,000
2015	22,581,000				22,581,000
2016	21,626,000				21,626,000
2017	20,147,000				20,147,000
2018	18,476,000				18,476,000
Thereafter	191,657,000				191,657,000
Total	298,263,000				298,263,000
Operating leases, rent expense	31,500,000		32,100,000	31,600,000
First lien GSE eligible mortgage loans originated and sold					7,900,000,000
First and second lien non-GSE eligible mortgage loans originated and sold					3,400,000,000
Mortgage repurchase claim expense	1,700,000		6,700,000	4,100,000
Accrued liabilities related to mortgage repurchase claims	4,100,000		5,200,000		4,100,000
Home equity and consumer mortgage loans secured by first and second liens	3,110,000,000		2,950,000,000		3,110,000,000
Guarantee Obligations [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	6,747,389,000				6,747,389,000
Standby and Commercial Letters of Credit [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	155,494,000	[1]			155,494,000	[1]
Commitments to Fund Commercial Real Estate, Construction, and Land Development Loans [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	1,341,994,000				1,341,994,000
Unused Credit Card Lines [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	922,358,000				922,358,000
Commitments under Home Equity Lines of Credit [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	896,817,000				896,817,000
Commitments to Fund Commercial and Industrial Loans [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	3,290,598,000				3,290,598,000
Other Loan Commitments [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	140,128,000				140,128,000
Home Equity and Consumer Mortgage Loans in States Which Foreclosures Proceed through Courts [Member]
Operating Leases, Future Minimum Payments Due [Abstract]
Home equity and consumer mortgage loans secured by first and second liens	$ 992,000,000		$ 922,000,000		$ 992,000,000

[1] *Represents the contractual amount net of risk participations of $116 million.