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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance $ 10,533 $ 9,688 $ 9,821 $ 9,858
New instruments acquired 389 540 741 1,074
Change due to principal payments (210) (164) (409) (326)
Changes in fair value of servicing assets 117 (198) 676 (740)
Balance 10,829 9,866 10,829 9,866
Servicing Assets [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance 10,533 9,688 9,821 9,858
New instruments acquired 389 540 741 1,074
Change due to principal payments (210) (164) (409) (326)
Changes in fair value of servicing assets 117 (198) 676 (740)
Balance $ 10,829 $ 9,866 $ 10,829 $ 9,866