Loan Servicing (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Transfers and Servicing of Financial Assets [Abstract]
Serviced sold mortgage loans	$ 1,340,000,000	$ 1,300,000,000	$ 1,340,000,000	$ 1,300,000,000	$ 1,310,000,000
Serviced sold mortgage loans with recourse	11,500,000	19,100,000	11,500,000	19,100,000
Mortgage Loans Sold with Recourse, Reserve	670,000		670,000
Servicing fees included in other service income	$ 900,000	$ 900,000	$ 2,700,000	$ 2,700,000,000