Loan Servicing (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Loan Servicing [Abstract]
Serviced sold mortgage loans	$ 1,410,000,000	$ 1,510,000,000	$ 1,410,000,000	$ 1,510,000,000
Servicing fees included in other service income	1,500,000	1,700,000	4,300,000	4,400,000
Serviced sold mortgage loans with recourse	$ 30,600,000	$ 42,000,000	$ 30,600,000	$ 42,000,000