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Loans and Allowance for Loan Losses - Impairment Methodology (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Allowance for loan losses:            
Individually evaluated for impairment $ 708   $ 1,194      
Collectively evaluated for impairment 11,470   10,458      
Total 12,178 $ 11,883 11,652 $ 11,358 $ 11,212 $ 10,852
Loans outstanding:            
Individually evaluated for impairment 7,255   8,478      
Collectively evaluated for impairment 1,144,263   1,138,149      
Total 1,151,518   1,146,627      
Commercial, financial, and agricultural            
Allowance for loan losses:            
Individually evaluated for impairment 361   551      
Collectively evaluated for impairment 2,528   2,686      
Total 2,889 2,783 3,237 3,486 3,943 3,325
Loans outstanding:            
Individually evaluated for impairment 1,578   2,428      
Collectively evaluated for impairment 191,689   205,292      
Total 193,267   207,720      
Residential real estate | Construction            
Allowance for loan losses:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 84   140      
Total 84 69 140 240 201 170
Loans outstanding:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 23,782   28,610      
Total 23,782   28,610      
Residential real estate | Mortgages            
Allowance for loan losses:            
Individually evaluated for impairment 296   579      
Collectively evaluated for impairment 1,650   1,492      
Total 1,946 1,772 2,071 2,341 2,109 1,689
Loans outstanding:            
Individually evaluated for impairment 3,902   4,793      
Collectively evaluated for impairment 244,533   236,724      
Total 248,435   241,517      
Commercial real estate | Construction            
Allowance for loan losses:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 801   757      
Total 801 704 757 746 905 807
Loans outstanding:            
Individually evaluated for impairment 145   153      
Collectively evaluated for impairment 124,244   106,631      
Total 124,389   106,784      
Commercial real estate | Mortgages            
Allowance for loan losses:            
Individually evaluated for impairment 34   37      
Collectively evaluated for impairment 6,061   4,877      
Total 6,095 6,109 4,914 4,071 3,630 4,437
Loans outstanding:            
Individually evaluated for impairment 1,469   850      
Collectively evaluated for impairment 528,541   528,686      
Total 530,010   529,536      
Installment and other consumer            
Allowance for loan losses:            
Individually evaluated for impairment 17   27      
Collectively evaluated for impairment 311   307      
Total 328 307 334 398 413 345
Loans outstanding:            
Individually evaluated for impairment 161   254      
Collectively evaluated for impairment 31,474   32,206      
Total 31,635   32,460      
Unallocated            
Allowance for loan losses:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 35   199      
Total 35 $ 139 199 $ 76 $ 11 $ 79
Loans outstanding:            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 0   0      
Total $ 0   $ 0