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Fair Value of Financial Instruments (Reconciliation of assets and liabilities using significant unobservable inputs (Level 3)) (Details) - Fair Value, Measurements, Recurring [Member] - Servicing Assets [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance $ 10,716 $ 9,821
New instruments acquired 302 352
Change due to principal payments (201) (199)
Changes in fair value of servicing assets (194) 559
Balance $ 10,623 $ 10,533