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Intangible Assets - Mortgage Servicing Rights (Details) - Mortgage servicing rights (MSRs) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Mortgage Servicing Rights      
Mortgage loans serviced for others $ 288,900,000 $ 270,600,000 $ 292,700,000
Mortgage loan servicing fees reported as non-interest income $ 193,000 $ 188,000