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Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Servicing asset:          
Balance at beginning of period $ 28,886 $ 26,288 $ 28,124 $ 25,399  
Additions 2,671 4,446 8,842 9,849  
Amortization (2,236) (2,885) (7,645) (7,399)  
Balance before valuation allowance at end of period 29,321 27,849 29,321 27,849  
Valuation allowance:          
Balance at beginning of period (105) (2,253) (1,407) (31)  
(Additions)/recoveries 5 (95) 1,307 (2,317)  
Balance at end of period (100) (2,348) (100) (2,348)  
Loan servicing rights, net $ 29,221 $ 25,501 $ 29,221 $ 25,501 $ 26,700