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Other Real Estate Owned (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Repossessed Assets [Abstract]      
Real Estate Acquired Through Foreclosure, Valuation Adjustments $ 2.8 $ 0.0  
Real Estate Acquired Through Foreclosure [Roll Forward]      
Balance at beginning of year 2.0 2.5 $ 8.5
OREO acquired through acquisitions 15.8 0.0 0.0
Additions 0.4 0.9 3.3
Valuation adjustments (2.8) 0.0 (0.1)
Dispositions (2.7) (1.4) (9.2)
Balance at end of year 12.7 2.0 2.5
Write-downs of OREO (2.8) $ 0.0 $ (0.1)
Mortgage Loans in Process of Foreclosure, Amount 0.0    
Carrying value of foreclosed OREO $ 0.0