Loan Servicing (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Loan Servicing [Abstract]
Serviced sold mortgage loans	$ 1,300,000,000	$ 1,440,000,000	$ 1,350,000,000
Serviced sold mortgage loans with recourse	22,600,000	34,100,000
Servicing fees included in other service income	$ 1,200,000	$ 1,400,000