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Mortgage Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mortgage Operations [Abstract]      
Real estate mortgage loans serviced $ 206,208 $ 208,862  
Mortgage servicing rights [Roll Forward]      
Beginning balance 1,481 1,579 $ 1,712
Additions 575 198 141
Reductions (428) (296) (274)
Ending balance 1,628 1,481 1,579
Valuation allowance [Roll Forward]      
Beginning balance 0 0 0
Additions (386) 0 0
Reductions 0 0 0
Ending balance (386) 0 0
Mortgage servicing rights, net of valuation allowance [Roll Forward]      
Beginning balance 1,481 1,579 1,712
Additions 189 198 141
Reductions (428) (296) (274)
Ending balance 1,242 1,481 1,579
Fair value of mortgage servicing rights asset 1,242 1,631  
Contractually specified servicing fees $ 528 $ 523 $ 549