Loans and Leases - Summary of Major Loan and Lease Categories (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	$ 6,579,086	$ 6,567,214	$ 6,239,804
Less: Allowance for credit losses, loans and leases	(85,632)	(85,387)
Net loans and leases held for investment	6,493,454	6,481,827
Unearned lease income	31,326	30,485
Net deferred costs, included in the above table	7,964	7,949
Overdraft deposits included in the above table	105	280
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	1,014,568	989,723	1,032,753
Real estate-commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	3,283,729	3,302,798	3,128,210
Real estate-construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	379,995	394,462	376,569
Real estate-residential secured for business purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	524,196	517,002	498,505
Real estate-residential secured for personal purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	922,412	909,015	779,557
Real estate-home equity secured for personal purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	177,446	179,282	172,073
Loans to individuals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	27,200	27,749	28,656
Lease financings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net of deferred income	$ 249,540	$ 247,183	$ 223,481