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Loan Servicing (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Transfers and Servicing of Financial Assets [Abstract]          
Serviced sold mortgage loans $ 1,350,000 $ 1,290,000 $ 1,350,000 $ 1,290,000 $ 1,330,000
Serviced sold mortgage loans with recourse 3,400 4,500 3,400 4,500 4,100
Mortgage Loans Sold with Recourse, Reserve 301   301   $ 266
Servicing fees included in other service income $ 900 $ 800 $ 1,800 $ 1,700