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Mortgage Servicing Rights (Amortization method rollforward) (Details 3) - Mortgage Servicing Rights - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mortgage Servicing Rights Accounted for Under the Amortization Method {Rollforward)    
Balance at Beginning of Period $ 23,020 $ 23,168
Servicing Rights that Resulted From Asset Transfers 551 621
Amortization (690) (700)
Balance at End of Period 22,881 23,089
Fair Value of Mortgage Servicing Rights Accounted for Under the Amortization Method    
Beginning of Period 29,218 26,716
End of Period $ 26,814 $ 28,600