Mortgage Servicing Rights (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Mortgage Servicing Rights (Textual) [Abstract]
Company serviced residential mortgage loan for others	$ 207,400,000,000		$ 207,400,000,000		$ 191,100,000,000
Gain/Loss on the fair value of mortgage servicing rights and fair value changes of derivatives used to offset MSR	32,000,000	82,000,000	62,000,000	144,000,000
Loan servicing fees	$ 174,000,000	$ 160,000,000	$ 345,000,000	$ 317,000,000