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Repurchase Agreements (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Secured Debt, Repurchase Agreements    
Carrying amount of securities sold under repurchase agreements with customers $ 375.4 $ 394.9
Carrying amount of the securities pledged to collateralize repurchase agreements $ 447.5 $ 515.9