Mortgage Banking Activities, Loan Servicing Portfolio (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2011		Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009
Stratification of Mortgage Loan Servicing Portfolio [Line Items]
Fair value	$ 109,192		$ 120,345	$ 115,723	$ 98,942	$ 119,066	$ 73,824
Outstanding principal of loans serviced	11,283,442	[1]
Weighted average prepayment rate (in hundredths)	15.67%	[2]
Loan Receivable Aging [Abstract]
Current	10,791,782
30 to 59 Days	208,804
60 to 89 Days	57,943
90 Days or More	224,913
Total	11,283,442	[1]
Interest Rate Range Less than 4.50% [Member]
Stratification of Mortgage Loan Servicing Portfolio [Line Items]
Fair value	10,120
Outstanding principal of loans serviced	1,144,667	[1]
Weighted average prepayment rate (in hundredths)	11.16%	[2]
Loan Receivable Aging [Abstract]
Total	1,144,667	[1]
Interest Rate Range 4.50% to 5.49% [Member]
Stratification of Mortgage Loan Servicing Portfolio [Line Items]
Fair value	62,499
Outstanding principal of loans serviced	5,496,830	[1]
Weighted average prepayment rate (in hundredths)	10.26%	[2]
Loan Receivable Aging [Abstract]
Total	5,496,830	[1]
Interest Rate Range 5.50% to 6.49% [Member]
Stratification of Mortgage Loan Servicing Portfolio [Line Items]
Fair value	31,015
Outstanding principal of loans serviced	3,339,781	[1]
Weighted average prepayment rate (in hundredths)	17.27%	[2]
Loan Receivable Aging [Abstract]
Total	3,339,781	[1]
Interest Rate Range Greater than 6.49% [Member]
Stratification of Mortgage Loan Servicing Portfolio [Line Items]
Fair value	5,558
Outstanding principal of loans serviced	1,302,164	[1]
Weighted average prepayment rate (in hundredths)	38.37%	[2]
Loan Receivable Aging [Abstract]
Total	1,302,164	[1]
FHLMC [Member]
Stratification of Mortgage Loan Servicing Portfolio [Line Items]
Outstanding principal of loans serviced	5,595,035
Loan Receivable Aging [Abstract]
Current	5,469,151
30 to 59 Days	47,973
60 to 89 Days	15,238
90 Days or More	62,673
Total	5,595,035
FNMA [Member]
Stratification of Mortgage Loan Servicing Portfolio [Line Items]
Outstanding principal of loans serviced	1,388,902
Loan Receivable Aging [Abstract]
Current	1,333,645
30 to 59 Days	23,490
60 to 89 Days	5,728
90 Days or More	26,039
Total	1,388,902
GNMA [Member]
Stratification of Mortgage Loan Servicing Portfolio [Line Items]
Outstanding principal of loans serviced	3,823,120
Loan Receivable Aging [Abstract]
Current	3,541,114
30 to 59 Days	127,350
60 to 89 Days	33,900
90 Days or More	120,756
Total	3,823,120
Other Investor Loans [Member]
Stratification of Mortgage Loan Servicing Portfolio [Line Items]
Outstanding principal of loans serviced	476,385
Loan Receivable Aging [Abstract]
Current	447,872
30 to 59 Days	9,991
60 to 89 Days	3,077
90 Days or More	15,445
Total	$ 476,385

[1] Excludes outstanding principal of $833 million for loans serviced for affiliates

[2] Annual prepayment estimates based upon loan interest rate, original term and loan type