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Loan Servicing - Summary of Activity for Mortgage Servicing Rights of Acquisition (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Servicing rights:      
Beginning balance $ 1,468 $ 1,242 $ 854
Additions 813 627 701
Amortization to expense (560) (401) (313)
Ending balance $ 1,721 $ 1,468 $ 1,242