Loan Servicing (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Transfers and Servicing of Financial Assets [Abstract]
Serviced sold mortgage loans	$ 1,350,000,000	$ 1,290,000,000	$ 1,350,000,000	$ 1,290,000,000	$ 1,310,000,000
Serviced sold mortgage loans with recourse	12,300,000	20,300,000	12,300,000	20,300,000
Mortgage Loans Sold with Recourse, Reserve	265,000		265,000
Servicing fees included in other service income	$ 900,000	$ 900,000	$ 1,800,000	$ 1,800,000