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Investment Securities - Additional disclosures (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Additional disclosures    
Carrying value of investment securities pledged to secure public funds deposits and for other purposes required and permitted by law $ 2.1 $ 726.1
Carrying amount of the securities pledged to collateralize repurchase agreements $ 515.9 $ 242.2