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Mortgage Servicing Rights - Net Carrying Values (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Servicing Rights    
Beginning Balance $ 4,518 $ 4,192
Additions 1,086 907
Amortization (665) (581)
Ending Balance 4,939 4,518
Valuation Allowance    
Beginning Balance (54) (59)
Temporary recapture (impairment) (223) 5
Ending Balance (277) (54)
Net Carrying Value    
Beginning balance 4,464 4,133
Additions 1,086 907
Amortization (665) (581)
Temporary recapture (impairment) (223) 5
Ending balance $ 4,662 $ 4,464