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Fair Value (Reconciliation of assets and liabilities using significant unobservable inputs (Level 3)) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance $ 10,829 $ 9,866 $ 9,821 $ 9,858
New instruments acquired 417 429 1,158 1,503
Change due to principal payments (184) (152) (593) (478)
Changes in fair value of servicing assets (196) (325) 480 (1,065)
Balance 10,866 9,818 10,866 9,818
Servicing Assets [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance 10,829 9,866 9,821 9,858
New instruments acquired 417 429 1,158 1,503
Change due to principal payments (184) (152) (593) (478)
Changes in fair value of servicing assets (196) (325) 480 (1,065)
Balance $ 10,866 $ 9,818 $ 10,866 $ 9,818