Loans and Leases - Summary of Major Loan and Lease Categories (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	$ 6,730,734	$ 6,567,214	$ 6,574,958
Less: Allowance for credit losses, loans and leases	(86,041)	(85,387)
Net loans and leases held for investment	6,644,693	6,481,827
Imputed interest on lease financings, included in the above table	(32,337)	(30,485)
Net deferred costs, included in the above table	7,810	7,949
Overdraft deposits included in the above table	148	280
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	1,044,043	989,723	1,050,004
Real estate-commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	3,442,083	3,302,798	3,275,140
Real estate-construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	285,616	394,462	427,561
Real estate-residential secured for business purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	530,674	517,002	516,471
Real estate-residential secured for personal purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	969,562	909,015	861,122
Real estate-home equity secured for personal purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	182,901	179,282	176,855
Loans to individuals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	26,794	27,749	27,331
Lease financings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	$ 249,061	$ 247,183	$ 240,474