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Loans and Allowance - Past Due Financing Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | $ 266,439 | $ 258,264 |
Non-accrual | 3,270 | 3,751 | $ 3,780
Total | 271,612 | 265,058 |
30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,843 | 3,007 |
Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 60 | 36 |
Consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 15,823 | 14,243 |
Non-accrual | 185 | 403 | 623
Total | 16,112 | 14,739 |
Consumer | 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 80 | 93 |
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 | 79,205 | 89,201 |
Non-accrual | 2,124 | 2,508 | 2,508
Total | 81,926 | 93,468 |
Residential Real estate | 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 597 | 1,759 |
Indirect |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 83,932 | 70,392 |
Non-accrual | 88 | 193 | 349
Total | 85,186 | 71,656 |
Indirect | 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 1,166 | 1,071 |
Commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 11,203 | 12,349 |
Non-accrual | 48 |  |
Total | 11,257 | 12,351 |
Commercial | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 6 | 2 |
Construction |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 3,188 | 4,279 |
Non-accrual | 318 |  |
Total | 3,536 | 4,397 |
Construction | 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due |  | 84 |
Construction | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Past Due | 30 | 34 |
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current | 73,088 | 67,800 |
Non-accrual | 507 | 647 | $ 300
Total | $ 73,595 | $ 68,447 |

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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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