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Loan Servicing - Loan Servicing Rights - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Loan Servicing    
Carrying amount/fair value $ 5,217 $ 3,650
Prepayment speed assumption (annual rate) (as a percent) 7.40% 7.42%
Residual cash flow discount rate assumption (annual) (as a percent) 12.96% 12.52%
Loan servicing rights    
Loan Servicing    
Valuation allowance $ 0 $ 0
Increase in loan servicing rights   $ 1,976