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Mortgage Servicing Rights - Key Economic Assumptions and Sensitivity of Current Fair Value of MSRs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]      
Fair value of MSRs $ 2,600 $ 4,800  
Residential Mortgage      
Servicing Assets at Fair Value [Line Items]      
Fair value of MSRs $ 2,632 $ 4,838 $ 6,277
Weighted average life (in years) 4 years 10 months 24 days 6 years  
Prepayment speeds (constant prepayment rate) 13.10% 10.50%  
10% adverse change $ (141) $ (149)  
20% adverse change $ (273) $ (297)  
Discount rate 9.56% 9.55%  
10% adverse change $ (81) $ (166)  
20% adverse change $ (156) $ (321)