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Mortgage Servicing Rights - Summary of Carrying Value Under the Amortization Method (Details) - Mortgage Servicing Rights - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mortgage Servicing Rights Accounted for Under the Amortization Method (Rollforward)        
Balance at Beginning of Period $ 21,401 $ 21,436 $ 18,694 $ 23,896
Servicing Rights that Resulted From Asset Transfers 1,260 1,005 2,940 2,170
Amortization (996) (1,301) (2,159) (2,413)
Valuation Allowance Recovery (Provision) (1,067) 696 1,123 (1,817)
Balance at End of Period 20,598 21,836 20,598 21,836
Balance at Beginning of Period (1,702) (2,513) (3,892)  
Valuation Allowance Recovery (Provision) (1,067) 696 1,123 (1,817)
Balance at End of Period (2,769) (1,817) (2,769) (1,817)
Fair Value of Mortgage Servicing Rights Accounted for Under the Amortization Method        
Beginning of Period 21,401 21,436 18,694 25,714
End of Period $ 20,598 $ 21,836 $ 20,598 $ 21,836