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Intangible Assets - Mortgage Servicing Rights (Details) - Mortgage Servicing Rights - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Mortgage Servicing Rights          
Mortgage loans serviced for others $ 231.1 $ 252.3 $ 231.1 $ 252.3 $ 240.5
Mortgage loan servicing fees reported as non-interest income $ 0.2 $ 0.2 $ 0.3 $ 0.4