Loans and Leases - Summary of Major Loan and Lease Categories (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases held for investment	$ 6,826,583	$ 6,567,214
Loans and Leases Receivable, Allowance	(87,091)	(85,387)
Net loans and leases held for investment	6,739,492	6,481,827
Unearned Lease Income	(31,927)	(30,485)
Net deferred costs, included in the above table	6,992	7,949
Overdraft deposits included in the above table	104	280
Commercial, Financial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases held for investment	1,037,835	989,723
Real Estate-Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases held for investment	3,530,451	3,302,798
Real Estate-Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases held for investment	274,483	394,462
Real Estate-Residential Secured for Business Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases held for investment	536,095	517,002
Real Estate-Residential Secured for Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases held for investment	994,972	909,015
Real Estate-Home Equity Secured for Personal Purpose [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases held for investment	186,836	179,282
Loans to Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases held for investment	21,250	27,749
Lease Financings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases held for investment	$ 244,661	$ 247,183

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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