Loan and Lease Receivables and Allowance for Credit Losses - Additional Information (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	$ 6,765,026,000	$ 6,671,526,000
Loans held for sale pledged as security for borrowings	2,100,000,000	2,200,000,000
Accrued interest on loans and leases	37,800,000	38,900,000
Allowance for loan and lease losses	102,366,000	101,686,000	$ 90,465,000	$ 81,924,000
Acquired Impaired Loans
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan and lease losses	10,100,000	10,000,000
Acquired Non Impaired Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for loan and lease losses	4,600,000	4,700,000
Installment and Other
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	3,076,000	3,138,000
Overdraft deposits reclassified as loans	1,200,000	754,000
Allowance for loan and lease losses	33,000	36,000	$ 25,000	$ 24,000
U.S. Government Guaranteed Loans
Accounts Notes And Loans Receivable [Line Items]
Total loans and leases	101,000,000	93,300,000
Discount on the unguaranteed portion of government guaranteed loans	$ 25,900,000	$ 26,200,000