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Loans - Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Credit quality categories    
Total $ 1,140,336 $ 1,094,938
Pass    
Credit quality categories    
Total 1,107,439 1,057,602
Special Mention    
Credit quality categories    
Total 12,333 14,826
Substandard    
Credit quality categories    
Total 20,564 22,510
Commercial, financial, and agricultural    
Credit quality categories    
Total 148,294 146,110
Commercial, financial, and agricultural | Pass    
Credit quality categories    
Total 143,855 140,497
Commercial, financial, and agricultural | Special Mention    
Credit quality categories    
Total 1,777 2,943
Commercial, financial, and agricultural | Substandard    
Credit quality categories    
Total 2,662 2,670
Installment loans to individuals    
Credit quality categories    
Total 69,523 43,256
Installment loans to individuals | Pass    
Credit quality categories    
Total 69,523 43,256
Installment loans to individuals | Special Mention    
Credit quality categories    
Total 0 0
Installment loans to individuals | Substandard    
Credit quality categories    
Total 0 0
Residential | Real estate mortgage    
Credit quality categories    
Total 570,696 564,740
Residential | Real estate mortgage | Pass    
Credit quality categories    
Total 567,603 561,440
Residential | Real estate mortgage | Special Mention    
Credit quality categories    
Total 1,152 740
Residential | Real estate mortgage | Substandard    
Credit quality categories    
Total 1,941 2,560
Commercial | Real estate mortgage    
Credit quality categories    
Total 317,718 306,182
Commercial | Real estate mortgage | Pass    
Credit quality categories    
Total 292,505 277,916
Commercial | Real estate mortgage | Special Mention    
Credit quality categories    
Total 9,404 11,143
Commercial | Real estate mortgage | Substandard    
Credit quality categories    
Total 15,809 17,123
Construction | Real estate mortgage    
Credit quality categories    
Total 34,105 34,650
Construction | Real estate mortgage | Pass    
Credit quality categories    
Total 33,953 34,493
Construction | Real estate mortgage | Special Mention    
Credit quality categories    
Total 0 0
Construction | Real estate mortgage | Substandard    
Credit quality categories    
Total $ 152 $ 157