Loan Servicing (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Loan Servicing [Abstract]
Serviced sold mortgage loans	$ 1,420,000,000	$ 1,530,000,000	$ 1,420,000,000	$ 1,530,000,000
Servicing fees included in other service income	1,400,000	1,400,000	2,800,000	2,700,000
Serviced sold mortgage loans with recourse	$ 32,200,000	$ 48,300,000	$ 32,200,000	$ 48,300,000