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Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Expected amortization expense on mortgage servicing rights      
2022 $ 1,060    
2023 850    
2024 660    
2025 510    
2026 390    
Residential mortgage loans      
Mortgage Servicing Rights      
Unpaid principal balance $ 883,900 $ 838,450 $ 740,910