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Loan and Lease Receivables - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]            
Total loans and leases $ 4,610,440   $ 4,342,453      
Loans held for sale pledged as security for borrowings 2,000,000   2,300,000      
Allowance for loan and lease losses 60,598 $ 61,719 66,347 $ 61,258 $ 51,300 $ 31,936
Acquired Impaired Loans            
Accounts Notes And Loans Receivable [Line Items]            
Allowance for loan and lease losses     6,500      
Installment and Other            
Accounts Notes And Loans Receivable [Line Items]            
Total loans and leases 1,396   1,942      
Overdraft deposits reclassified as loans 477,000   496,000,000      
Allowance for loan and lease losses 7 $ 9 15 $ 37 $ 36 $ 50
U.S. Government Guaranteed Loans            
Accounts Notes And Loans Receivable [Line Items]            
Total loans and leases 396,600   635,000      
Discount on the unguaranteed portion of government guaranteed loans $ 27,900   $ 28,300