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Loans and Allowance - Current, past due, and non-accrual loans by categories of loans and restructured loans (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | $ 271,500 | $ 279,768 |  |
Past Due | 500 |  |  |
Non-accrual | 4,088 | 4,127 | $ 2,462 | $ 1,947
Total | 276,960 | 284,738 |  |
30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 1,353 | 822 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
90 Days or More and Still Accruing | 19 | 21 |  |
Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 12,522 | 11,865 |  |
Non-accrual | 132 | 137 | 312 | 186
Total | 12,700 | 12,076 |  |
Consumer | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 46 | 74 |  |
Residential Real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 80,042 | 80,192 |  |
Non-accrual | 713 | 728 | 1,232 | 956
Total | 80,782 | 81,033 |  |
Residential Real estate | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 8 | 92 |  |
Residential Real estate | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
90 Days or More and Still Accruing | 19 | 21 |  |
Indirect |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 94,393 | 101,605 |  |
Non-accrual | 136 | 123 | 186 | 116
Total | 95,093 | 102,384 |  |
Indirect | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | 564 | 656 |  |
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 13,172 | 11,907 |  |
Non-accrual |  |  | 86 | 27
Total | 13,172 | 11,907 |  |
Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 2,563 | 3,317 |  |
Total | 2,563 | 3,317 |  |
Commercial Real Estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current | 68,808 | 70,882 |  |
Non-accrual | 3,107 | 3,139 | $ 646 | $ 662
Total | 72,650 | $ 74,021 |  |
Commercial Real Estate | 30-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past Due | $ 735 |  |  |

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