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Borrowed Funds - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Borrowed funds $ 16.6 $ 28.0 $ 28.5
Available-for-sale Securities      
Debt Instrument [Line Items]      
Securities sold under repurchase agreements $ 105.1 $ 56.5