Commitments and Contingencies (Details) (USD $)	12 Months Ended				96 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012
Loss Contingencies [Line Items]
Loan commitments and letters of credit	$ 75,000,000				$ 75,000,000
Contractual amount net of risk participations	127,000,000				127,000,000
Operating Leases, Future Minimum Payments Due [Abstract]
2013	27,907,000				27,907,000
2014	23,860,000				23,860,000
2015	21,032,000				21,032,000
2016	19,575,000				19,575,000
2017	17,842,000				17,842,000
Thereafter	183,753,000				183,753,000
Total	293,969,000				293,969,000
Operating leases, rent expense	32,100,000		31,600,000	32,300,000
First lien GSE eligible mortgage loans originated and sold					7,110,000,000
First and second lien non-GSE eligible mortgage loans originated and sold					3,100,000,000
Mortgage repurchase claim expense	6,700,000		4,100,000	1,300,000
Accrued liabilities related to mortgage repurchase claims	5,200,000		3,300,000		5,200,000
Home equity and consumer mortgage loans secured by first and second liens	2,940,000,000		3,030,000,000		2,940,000,000
Guarantee Obligations [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	5,814,025,000				5,814,025,000
Standby and Commercial Letters of Credit [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	162,839,000	[1]			162,839,000	[1]
Commitments to Fund Commercial Real Estate, Construction, and Land Development Loans [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	777,272,000				777,272,000
Unused Credit Card Lines [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	948,239,000				948,239,000
Commitments under Home Equity Lines of Credit [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	849,691,000				849,691,000
Commitments to Fund Commercial and Industrial Loans [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	2,977,320,000				2,977,320,000
Other Loan Commitments [Member]
Loss Contingencies [Line Items]
Loan commitments and letters of credit	98,664,000				98,664,000
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	$ 882,000,000		$ 890,000,000		$ 882,000,000

[1] represents the contractual amount net of risk participations of $127 million.