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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
Mar. 31, 2018
Dec. 31, 2017
Transfers and Servicing [Abstract]    
Effect on fair value of a 10% adverse change $ (6,483) $ (6,290)
Effect on fair value of a 20% adverse change (12,499) (12,093)
Effect on fair value of a 100 basis point adverse change (6,756) (5,840)
Effect on fair value of a 200 basis point adverse change $ (12,994) $ (11,249)