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Intangible Assets - Mortgage Servicing Rights (Details) - Mortgage servicing rights (MSRs) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Mortgage Servicing Rights          
Mortgage loans serviced for others $ 277,100,000 $ 289,300,000 $ 277,100,000 $ 289,300,000 $ 292,700,000
Mortgage loan servicing fees reported as non-interest income $ 195,000 $ 216,000 $ 581,000 $ 638,000