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Loans (Details 5) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]              
Recorded Investment, with no allowance $ 2,426     $ 2,426     $ 2,275
Recorded Investment, with allowance 144     144     256
Related Allowance 3 $ 14   3 $ 14   6
Recorded Investment 3,224 4,155   3,224 4,155   3,997
Unpaid Principal Balance 6,050 6,917   6,050 6,917   6,728
Average Recorded Investment 3,524 4,030   3,658 4,354   4,431
Interest Income Recognized 85   $ 98 239 168 $ 263 263
Commercial, Financial And Agricultural Loan [Member]              
Financing Receivable, Past Due [Line Items]              
Recorded Investment, with no allowance     400
Unpaid Principal Balance, with no Allowance     400
Average Recorded Investment, with no Allownace     600
Interest Income Recognized, with no allownace     49
Recorded Investment, with allowance 4   4  
Unpaid Principal Balance, with allowance 4   4  
Related Allowance 4   4  
Average Recorded Investment, with Allownace 4   4  
Interest Income Recognized, with allownace    
Recorded Investment 4   4   400
Unpaid Principal Balance 4   4   400
Average Recorded Investment 4   4   600
Interest Income Recognized     49
Construction Loans [Member]              
Financing Receivable, Past Due [Line Items]              
Recorded Investment, with no allowance    
Unpaid Principal Balance, with no Allowance    
Average Recorded Investment, with no Allownace    
Interest Income Recognized, with no allownace    
Recorded Investment, with allowance    
Unpaid Principal Balance, with allowance    
Related Allowance    
Average Recorded Investment, with Allownace    
Interest Income Recognized, with allownace    
Recorded Investment    
Unpaid Principal Balance    
Average Recorded Investment    
Interest Income Recognized    
Residential Mortgage [Member]              
Financing Receivable, Past Due [Line Items]              
Recorded Investment, with no allowance 327 538   327 538   392
Unpaid Principal Balance, with no Allowance 405 603   405 603   460
Average Recorded Investment, with no Allownace 323 537   337 594   439
Interest Income Recognized, with no allownace 9 12   11 16   19
Recorded Investment, with allowance    
Unpaid Principal Balance, with allowance    
Related Allowance    
Average Recorded Investment, with Allownace    
Interest Income Recognized, with allownace    
Recorded Investment 327 538   327 538   392
Unpaid Principal Balance 405 603   405 603   460
Average Recorded Investment 323 537   337 594   439
Interest Income Recognized 9 12   11 16   19
Commercial Real Estate [Member]              
Financing Receivable, Past Due [Line Items]              
Recorded Investment, with no allowance 2,706 3,172   2,706 3,172   2,879
Unpaid Principal Balance, with no Allowance 5,450 5,867   5,450 5,867   5,539
Average Recorded Investment, with no Allownace 3,013 3,092   3,071 3,259   2,961
Interest Income Recognized, with no allownace 73 79   217 131   170
Recorded Investment, with allowance 144 369   144 369   256
Unpaid Principal Balance, with allowance 144 369   144 369   256
Related Allowance 3 10   3 10   6
Average Recorded Investment, with Allownace 142 326   200 421   355
Interest Income Recognized, with allownace 2 6   9 19   23
Recorded Investment 2,850 3,541   2,850 3,541   3,135
Unpaid Principal Balance 5,594 6,236   5,594 6,236   5,795
Average Recorded Investment 3,155 3,418   3,271 3,680   3,316
Interest Income Recognized 75 85   226 150   193
Home Equity Line of Credit [Member]              
Financing Receivable, Past Due [Line Items]              
Recorded Investment, with no allowance 47 72   47 72   70
Unpaid Principal Balance, with no Allowance 51 74   51 74   73
Average Recorded Investment, with no Allownace 46 71   50 76   76
Interest Income Recognized, with no allownace 1 1   2 2   2
Recorded Investment, with allowance    
Unpaid Principal Balance, with allowance    
Related Allowance    
Average Recorded Investment, with Allownace    
Interest Income Recognized, with allownace    
Recorded Investment 47 72   47 72   70
Unpaid Principal Balance 51 74   51 74   73
Average Recorded Investment 46 71   50 76   76
Interest Income Recognized 1 1   2 2   2
Consumer Portfolio Segment [Member]              
Financing Receivable, Past Due [Line Items]              
Recorded Investment, with no allowance    
Unpaid Principal Balance, with no Allowance    
Average Recorded Investment, with no Allownace    
Interest Income Recognized, with no allownace    
Recorded Investment, with allowance    
Unpaid Principal Balance, with allowance    
Related Allowance    
Average Recorded Investment, with Allownace    
Interest Income Recognized, with allownace    
Recorded Investment    
Unpaid Principal Balance    
Average Recorded Investment    
Interest Income Recognized