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Servicing Rights - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Commercial servicing rights          
Servicing Assets at Fair Value [Line Items]          
Servicing rights $ 1,278   $ 1,278   $ 1,310
Commercial loans serviced for a third party 267,900   $ 267,900   $ 274,600
Constant prepayment rate (percent)     9.66%   9.66%
Discount rate (percent)     9.46%   9.46%
Other Noninterest Income          
Servicing Assets at Fair Value [Line Items]          
Mortgage servicing fees $ 745 $ 671 $ 2,200 $ 2,000