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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
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance $ 9,821 $ 9,858
New instruments acquired 352 534
Change due to principal payments (199) (162)
Changes in fair value of servicing assets 559 (542)
Balance 10,533 9,688
Servicing Assets [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance 9,821 9,858
New instruments acquired 352 534
Change due to principal payments (199) (162)
Changes in fair value of servicing assets 559 (542)
Balance $ 10,533 $ 9,688