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Mortgage Servicing Rights (Fair value method rollforward) (Details 2) - Mortgage Servicing Rights - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in fair value of the mortgage servicing rights accounted for under the fair value measurement method      
Balance at Beginning of Year $ 1,454 $ 1,655 $ 1,970
Changes in Fair Value:      
Due to Payoffs (164) (201) (315)
Total Changes in Fair Value of Mortgage Servicing Rights (164) (201) (315)
Balance at End of Year $ 1,290 $ 1,454 $ 1,655