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Other Real Estate Owned (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Real Estate Acquired Through Foreclosure [Roll Forward]          
Beginning balance $ 2.2 $ 8.2 $ 2.5 $ 8.5  
Additions 0.0 0.3 0.3 1.2  
Valuation adjustments     0.0 0.0  
Dispositions (0.2) (2.0) (0.8) (3.2)  
Ending balance 2.0 $ 6.5 2.0 $ 6.5  
Carrying values of foreclosed residential real estate properties 0.0   0.0   $ 0.0
Consumer mortgage loans collateralized by residential real estate property in the process of foreclosure $ 0.2   $ 0.2   $ 0.2