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Loans and Allowance for Loan Losses - Impairment Methodology (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Allowance for loan losses:            
Individually evaluated for impairment $ 4,932   $ 5,113      
Collectively evaluated for impairment 13,997   13,000      
Total 18,929 $ 18,735 18,113 $ 17,764 $ 16,622 $ 12,477
Loans outstanding:            
Individually evaluated for impairment 34,746   37,335      
Collectively evaluated for impairment 1,248,074   1,249,632      
Total 1,282,820   1,286,967      
Commercial, financial, and agricultural            
Allowance for loan losses:            
Individually evaluated for impairment 2,154   2,187      
Collectively evaluated for impairment 2,547   2,934      
Total 4,701 5,336 5,121 3,757 3,614 2,918
Loans outstanding:            
Individually evaluated for impairment 6,565   7,552      
Collectively evaluated for impairment 225,967   265,366      
Total 232,532   272,918      
Residential real estate | Construction            
Allowance for loan losses:            
Individually evaluated for impairment 0   27      
Collectively evaluated for impairment 235   186      
Total 235 251 213 233 171 64
Loans outstanding:            
Individually evaluated for impairment 0   192      
Collectively evaluated for impairment 33,514   29,500      
Total 33,514   29,692      
Residential real estate | Mortgages            
Allowance for loan losses:            
Individually evaluated for impairment 201   263      
Collectively evaluated for impairment 2,472   2,416      
Total 2,673 2,467 2,679 3,292 2,711 2,118
Loans outstanding:            
Individually evaluated for impairment 2,743   3,626      
Collectively evaluated for impairment 271,025   258,713      
Total 273,768   262,339      
Commercial real estate | Construction            
Allowance for loan losses:            
Individually evaluated for impairment 14   28      
Collectively evaluated for impairment 411   447      
Total 425 495 475 822 722 369
Loans outstanding:            
Individually evaluated for impairment 108   200      
Collectively evaluated for impairment 71,923   77,944      
Total 72,031   78,144      
Commercial real estate | Mortgages            
Allowance for loan losses:            
Individually evaluated for impairment 2,556   2,594      
Collectively evaluated for impairment 8,125   6,760      
Total 10,681 9,915 9,354 9,253 9,048 6,547
Loans outstanding:            
Individually evaluated for impairment 25,272   25,657      
Collectively evaluated for impairment 621,771   591,476      
Total 647,043   617,133      
Installment and other consumer            
Allowance for loan losses:            
Individually evaluated for impairment 7   14      
Collectively evaluated for impairment 248   250      
Total 255 252 264 337 306 381
Loans outstanding:            
Individually evaluated for impairment 58   108      
Collectively evaluated for impairment 23,874   26,633      
Total 23,932   26,741      
Unallocated            
Allowance for loan losses:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment (41)   7      
Total (41) $ 19 7 $ 70 $ 50 $ 80
Loans outstanding:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Total $ 0   $ 0