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Mortgage Servicing Rights - Schedule of Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Transfers and Servicing [Abstract]      
Mortgage servicing rights $ 5,489 $ 5,428 $ 4,491
Accumulated amortization (4,209) (4,160) (3,415)
Impairment reserve 0 0 (22)
Total servicing asset at fair value $ 1,280 $ 1,268 $ 1,054