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Loans and Leases - Summary of Major Loan and Lease Categories (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment $ 5,252,045 $ 5,306,841 $ 5,211,856
Loans and Leases Receivable, Allowance (70,146) (83,044)  
Net loans and leases held for investment 5,181,899 5,223,797  
Unearned lease income 18,445 17,670  
Net deferred costs (fees), included in the above table 1,696 (2,903)  
Overdraft deposits included in the above table 3,267 948  
Commercial Financial And Agricultural [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 927,015 892,665 894,314
Paycheck Protection Program Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 85,601 483,773 501,580
Real-Estate Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 2,669,898 2,458,872 2,369,691
Real-Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 260,874 243,355 233,590
Real Estate Residential Secured For Business Purpose [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 412,001 381,446 378,239
Real Estate-Residential Secured For Personal Purpose [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 535,705 487,600 474,688
Real Estate Home Equity Secured For Personal Purpose [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 159,029 166,609 172,448
Loans to Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment 26,458 27,482 27,771
Lease Financings [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases held for investment $ 175,464 $ 165,039 $ 159,535