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Loans and Leases - Summary of Major Loan and Lease Categories (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases held for investment $ 5,327,313 $ 5,306,841 $ 4,951,809  
Loans and Leases Receivable, Allowance (71,355) (83,044)    
Net loans and leases held for investment 5,255,958 5,223,797    
Unearned lease income 18,049 17,670    
Net deferred fees, included in the above table (2,044) (2,903)    
Overdraft deposits included in the above table 4,236 948    
Commercial Financial And Agricultural [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases held for investment 920,621 892,665 822,733  
Paycheck Protection Program Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases held for investment 252,849 483,773 498,978  
Real-Estate Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases held for investment 2,600,919 2,458,872 2,222,490  
Real-Estate Construction [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases held for investment 274,529 243,355 212,534  
Loans and Leases Receivable, Allowance     (4,130) $ (2,446)
Real Estate Residential Secured For Business Purpose [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases held for investment 407,664 381,446 376,050  
Real Estate-Residential Secured For Personal Purpose [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases held for investment 513,330 487,600 462,512  
Loans and Leases Receivable, Allowance     (2,669) $ (2,713)
Real Estate Home Equity Secured For Personal Purpose [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases held for investment 160,018 166,609 173,041  
Loans to Individuals [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases held for investment 25,845 27,482 29,222  
Lease Financings [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases held for investment $ 171,538 $ 165,039 $ 154,249