Credit Risk (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
Loan Servicing Portfolio Composition:
Loan Servicing Portfolio	$ 173,651	$ 166,075
Weighted Average Interest Rate	4.80%	4.90%
Portfolio Delinquency
Number of Loans	3.65%	4.24%
Unpaid Balance	3.22%	3.88%
Number of Loans	2.06%	2.30%
Conventional loans [Member]
Loan Servicing Portfolio Composition:
Loan Servicing Portfolio	140,198	136,261
Government Loans [Member]
Loan Servicing Portfolio Composition:
Loan Servicing Portfolio	26,810	23,100
Home equity lines of credit [Member]
Loan Servicing Portfolio Composition:
Loan Servicing Portfolio	6,643	6,714
Owned [Member]
Loan Servicing Portfolio Composition:
Loan Servicing Portfolio	144,615	140,160
Subserviced [Member]
Loan Servicing Portfolio Composition:
Loan Servicing Portfolio	$ 29,036	$ 25,915
30 days [Member]
Portfolio Delinquency
Number of Loans	2.17%	2.36%
Unpaid Balance	1.82%	2.01%
60 days [Member]
Portfolio Delinquency
Number of Loans	0.53%	0.67%
Unpaid Balance	0.47%	0.60%
90 or more days [Member]
Portfolio Delinquency
Number of Loans	0.95%	1.21%
Unpaid Balance	0.93%	1.27%
Foreclosure/real estate owned [Member]
Portfolio Delinquency
Unpaid Balance	2.13%	2.37%