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Mortgage Servicing Rights - Mortgage Servicing Rights Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Balance, January 1 $ 4,450    
Balance, December 31 2,626 $ 4,450  
Fair value 2,600 4,800  
Residential Mortgage      
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Balance, January 1 4,450 5,047 $ 5,861
Additions 0 0 16
Amortization (1,225) (576) (803)
Impairment (599) (21) (27)
Balance, December 31 2,626 4,450 5,047
Fair value 2,632 4,838 6,277
Residential mortgage loans serviced for others $ 370,703 $ 502,832 $ 578,788