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Mortgage Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mortgage Operations [Abstract]      
Real estate mortgage loans serviced $ 208,862 $ 211,845  
Mortgage servicing rights [Roll Forward]      
Beginning balance 1,579 1,712 $ 1,815
Additions 198 141 229
Reductions (296) (274) (332)
Ending balance 1,481 1,579 1,712
Valuation allowance [Roll Forward]      
Beginning balance 0 0 (21)
Additions 0 0 0
Reductions 0 0 21
Ending balance 0 0 0
Mortgage servicing rights, net of valuation allowance [Roll Forward]      
Beginning balance 1,579 1,712 1,794
Additions 198 141 229
Reductions (296) (274) (311)
Ending balance 1,481 1,579 1,712
Fair value of mortgage servicing rights asset 1,631 2,091  
Contractually specified servicing fees $ 523 $ 549 $ 575