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Loan Servicing Rights - Components of Loan Servicing Rights and Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Servicing asset:      
Balance at beginning of period $ 28,124 $ 25,399 $ 24,512
Additions 11,759 12,810 6,499
Amortization (9,798) (10,085) (5,612)
Balance before valuation allowance at end of period 30,085 28,124 25,399
Valuation allowance:      
Balance at beginning of period (1,407) (31) (15)
(Additions)/recoveries 1,361 (1,376) (16)
Balance at end of period (46) (1,407) (31)
Loan servicing rights, net $ 30,039 $ 26,717 $ 25,368