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Loans and Leases - Summary of Major Loan and Lease Categories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment $ 5,310,017 $ 5,306,841
Loans and Leases Receivable, Allowance (71,924) (83,044)
Loans 5,238,093 5,223,797
Unearned Lease Income (19,104) (17,670)
Net deferred costs (fees), included in the above table 3,408 (2,903)
Overdraft deposits included in the above table 4,268 948
Commercial, Financial and Agricultural [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 956,396 892,665
Paycheck Protection Program Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 31,748 483,773
Real Estate-Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 2,718,535 2,458,872
Real Estate-Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 283,918 243,355
Real Estate-Residential Secured for Business Purpose [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 409,900 381,446
Real Estate-Residential Secured for Personal Purpose [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 540,566 487,600
Real Estate-Home Equity Secured for Personal Purpose [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 158,909 166,609
Loans to Individuals [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment 25,504 27,482
Lease Financings [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases held for investment $ 184,541 $ 165,039