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Loans - Narrative (Details) - Commercial Portfolio Segment
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
loan
Gain (Loss) on Securities [Line Items]      
Proceeds from sale of loans   $ 74.1 $ 36.9
Realized gains   0.4  
Repayments of long-term lines of credit   26.0  
Realized loss on sale of loan   2.9 $ 6.5
Number of loans sold | loan     2
Loan L      
Gain (Loss) on Securities [Line Items]      
Proceeds from interest   $ 3.0  
Loan G & I      
Gain (Loss) on Securities [Line Items]      
Proceeds from sale of loans $ 74.3