Mortgage Servicing Rights (Sensitivity analysis) (Details 5) - Mortgage Servicing Rights - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Constant Prepayment Rate
Decrease in fair value from 25 basis points (“bps”) adverse change	$ (360)	$ (332)
Decrease in fair value from 50 bps adverse change	(717)	(657)
Discount Rate
Decrease in fair value from 25 bps adverse change	(314)	(289)
Decrease in fair value from 50 bps adverse change	$ (621)	$ (572)