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Loans and Leases - Summary of Major Loan and Lease Categories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment $ 6,123,230 $ 5,310,017
Loans and Leases Receivable, Allowance (79,004) (71,924)
Loans 6,044,226 5,238,093
Unearned Lease Income (21,932) (19,104)
Net deferred costs, included in the above table 6,053 3,408
Overdraft deposits included in the above table 93 4,268
Commercial, Financial and Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 1,086,781 956,396
Paycheck Protection Program Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 2,147 31,748
Real Estate-Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 3,027,955 2,718,535
Real Estate-Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 381,811 283,918
Real Estate-Residential Secured for Business Purpose [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 478,254 409,900
Real Estate-Residential Secured for Personal Purpose [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 730,395 540,566
Real Estate-Home Equity Secured for Personal Purpose [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 176,699 158,909
Loans to Individuals [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 27,873 25,504
Lease Financings [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment $ 211,315 $ 184,541