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Loans and Allowance for Loan Losses - Summary of Loans by Major Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Loans and Allowance for Loan Losses    
Total loans $ 1,156,943 $ 1,146,627
Commercial, financial, and agricultural    
Loans and Allowance for Loan Losses    
Total loans 201,232 207,720
Residential real estate | Construction    
Loans and Allowance for Loan Losses    
Total loans 24,527 28,610
Residential real estate | Mortgages    
Loans and Allowance for Loan Losses    
Total loans 248,980 241,517
Commercial real estate | Construction    
Loans and Allowance for Loan Losses    
Total loans 120,931 106,784
Commercial real estate | Mortgages    
Loans and Allowance for Loan Losses    
Total loans 529,217 529,536
Installment and other consumer    
Loans and Allowance for Loan Losses    
Total loans $ 32,056 $ 32,460