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Loans and Leases - Summary of Major Loan and Lease Categories (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment $ 5,849,259 $ 5,310,017 $ 5,252,045
Loans and Leases Receivable, Allowance (74,929) (71,924)  
Net loans and leases held for investment 5,774,330 5,238,093  
Unearned lease income 19,714 19,104  
Net deferred costs, included in the above table 5,962 3,408  
Overdraft deposits included in the above table 167 4,268  
Commercial Financial And Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 1,052,733 956,396 927,015
Paycheck Protection Program Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 2,207 31,748 85,601
Real-Estate Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 2,936,204 2,718,535 2,669,898
Real-Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 329,915 283,918 260,874
Real Estate Residential Secured For Business Purpose [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 443,837 409,900 412,001
Real Estate-Residential Secured For Personal Purpose [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 685,771 540,566 535,705
Real Estate Home Equity Secured For Personal Purpose [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 175,843 158,909 159,029
Loans to Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 26,679 25,504 26,458
Lease Financings [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment $ 196,070 $ 184,541 $ 175,464