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Residential Mortgage Servicing Rights (Sensitivity Analysis of Current Fair Value to Changes in Discount and Prepayment Speed Assumptions) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Transfers and Servicing [Abstract]    
Effect on fair value of a 10% adverse change $ (5,410) $ (7,104)
Effect on fair value of a 20% adverse change (10,403) (13,651)
Effect on fair value of a 100 basis point adverse change (4,366) (6,438)
Effect on fair value of a 200 basis point adverse change $ (8,418) $ (12,398)