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Acquired Loans - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]          
Outstanding balance of PCD loans $ 206.2   $ 206.2   $ 247.3
Acquired and covered receivables          
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]          
Accretion on acquired loans $ 6.2 $ 8.0 $ 19.4 $ 21.9