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Acquired Loans - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]          
Outstanding balance of PCI loans $ 284.3   $ 284.3   $ 243.0
Acquired and covered receivables          
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]          
Accretion on acquired loans $ 7.0 $ 10.3 $ 13.9 $ 16.7