Other Loans Held for Sale (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans transferred to other loans held for sale, carrying value	$ 731,906,000	$ 486,697,000	$ 959,261,000
Loan charge offs	556,775,000	639,714,000	1,417,923,000
Before Transfer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans transferred to other loans held for sale, carrying value	999,600,000	681,600,000	1,360,000,000
Loan charge offs	267,600,000	194,900,000	405,000,000
New Cost Basis After Transfer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans transferred to other loans held for sale, fair value	$ 731,900,000	$ 486,700,000	$ 959,300,000