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Loans (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, Related Allowance | $ 1 | $ 3 | $ 1 | $ 3 | $ 2
Impaired Financing Receivable, Recorded Investment | 1,832 | 3,224 | 1,832 | 3,224 | 6,113
Impaired Financing Receivable, Unpaid Principal Balance | 4,220 | 6,050 | 4,220 | 6,050 | 8,649
Impaired Financing Receivable, Average Recorded Investment | 1,991 | 3,524 | 2,560 | 3,658 | 6,375
Impaired Financing Receivable, Interest Income, Accrual Method | 61 | 85 | 197 | 239 | 403
Commercial, Financial And Agricultural Loan [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, Related Allowance |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, Interest Income, Accrual Method |  |  |  |  |
Construction Loans [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, Related Allowance |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, Interest Income, Accrual Method |  |  |  |  |
Residential Mortgage [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 207 | 327 | 207 | 327 | 440
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 259 | 405 | 259 | 405 | 499
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 133 | 323 | 196 | 337 | 440
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 3 | 9 | 8 | 11 | 1
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, Related Allowance |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 207 | 327 | 207 | 327 | 440
Impaired Financing Receivable, Unpaid Principal Balance | 259 | 405 | 259 | 405 | 499
Impaired Financing Receivable, Average Recorded Investment | 133 | 323 | 196 | 337 | 440
Impaired Financing Receivable, Interest Income, Accrual Method | 3 | 9 | 8 | 11 | 1
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,538 | 2,706 | 1,538 | 2,706 | 5,508
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 3,869 | 5,450 | 3,869 | 5,450 | 7,980
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,772 | 3,013 | 2,239 | 3,071 | 5,770
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 57 | 73 | 183 | 217 | 388
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 67 | 144 | 67 | 144 | 123
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance | 67 | 144 | 67 | 144 | 123
Impaired Financing Receivable, Related Allowance | 1 | 3 | 1 | 3 | 2
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 67 | 142 | 104 | 200 | 123
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method | 1 | 2 | 5 | 9 | 11
Impaired Financing Receivable, Recorded Investment | 1,605 | 2,850 | 1,605 | 2,850 | 5,631
Impaired Financing Receivable, Unpaid Principal Balance | 3,936 | 5,594 | 3,936 | 5,594 | 8,103
Impaired Financing Receivable, Average Recorded Investment | 1,839 | 3,155 | 2,343 | 3,271 | 5,893
Impaired Financing Receivable, Interest Income, Accrual Method | 58 | 75 | 188 | 226 | 399
Home Equity Line of Credit [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 20 | 47 | 20 | 47 | 42
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance | 25 | 51 | 25 | 51 | 47
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 19 | 46 | 21 | 50 | 42
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  | 1 | 1 | 2 | 3
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, Related Allowance |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 20 | 47 | 20 | 47 | 42
Impaired Financing Receivable, Unpaid Principal Balance | 25 | 51 | 25 | 51 | 47
Impaired Financing Receivable, Average Recorded Investment | 19 | 46 | 21 | 50 | 42
Impaired Financing Receivable, Interest Income, Accrual Method |  | 1 | 1 | 2 | 3
Consumer Portfolio Segment [Member] |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, Related Allowance |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  |  |  |  |
Impaired Financing Receivable, Unpaid Principal Balance |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment |  |  |  |  |
Impaired Financing Receivable, Interest Income, Accrual Method |  |  |  |  |

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