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Deposits - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Banking And Thrift [Abstract]      
Interest expense, Time deposits, $100,000 or more $ 27.8 $ 13.4 $ 10.3
Brokered deposits for regulatory purposes $ 314.2