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Loans and Allowance for Loan Losses - Current, past due, and non-accrual loans by categories of loans and restructured loans (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | $ 293,836 | $ 266,439 |
Non-accrual | 1,947 | 3,270 | $ 3,751
Total | 299,120 | 271,612 |
30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,726 | 1,843 |
Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,611 | 60 |
Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 12,669 | 15,823 |
Non-accrual | 186 | 185 | 403
Total | 13,071 | 16,112 |
Consumer | 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 216 | 80 |
Consumer | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due |  | 24 |
Residential Real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 79,975 | 79,205 |
Non-accrual | 956 | 2,124 | 2,508
Total | 82,637 | 81,926 |
Residential Real estate | 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 732 | 597 |
Residential Real estate | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 974 |  |
Residential real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total | 82,637 | 81,926 |
Indirect |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 115,805 | 83,932 |
Non-accrual | 116 | 88 | 193
Total | 116,698 | 85,186 |
Indirect | 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 692 | 1,166 |
Indirect | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 85 |  |
Construction |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 2,317 | 3,188 |
Non-accrual |  | 318 |
Total | 2,317 | 3,536 |
Construction | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due |  | 30 |
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 68,926 | 73,088 |
Non-accrual | 662 | 507 | $ 647
Total | 70,113 | 73,595 |
Commercial Real Estate | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 525 |  |
Commercial Mortgage Portfolio Segment |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 14,144 | 11,203 |
Non-accrual | 27 | 48 |
Total | 14,284 | 11,257 |
Commercial Mortgage Portfolio Segment | 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 86 |  |
Commercial Mortgage Portfolio Segment | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | $ 27 | $ 6 |

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- Definition Financing receivables that are current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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