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Intangible Assets - Mortgage Servicing Rights (Details) - Mortgage Servicing Rights - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Mortgage Servicing Rights          
Mortgage loans serviced for others $ 252.3 $ 286.6 $ 252.3 $ 286.6 $ 270.0
Mortgage loan servicing fees reported as non-interest income $ 0.2 $ 0.2 $ 0.4 $ 0.4