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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | $ 6,353 | $ 8,096 |
Current | 385,368 | 370,314 |
Total loans | 391,721 | 378,410 | $ 367,490
Non- Accrual Loans | 6,666 | 8,000 |
90 Days or More Past Due and Accruing | 600 |  |
Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 1,404 | 2,512 |
Current | 30,605 | 26,963 |
Total loans | 32,009 | 29,475 | 32,795
Non- Accrual Loans | 1,979 | 1,787 |
Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 1,502 | 1,581 |
Current | 171,763 | 162,146 |
Total loans | 173,265 | 163,727 | 151,043
Non- Accrual Loans | 520 | 1,342 |
90 Days or More Past Due and Accruing | 129 |  |
Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 3,281 | 3,873 |
Current | 152,115 | 147,929 |
Total loans | 155,396 | 151,802 |
Non- Accrual Loans | 4,047 | 4,756 |
90 Days or More Past Due and Accruing | 374 |  |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 158 | 116 |
Current | 19,161 | 21,050 |
Total loans | 19,319 | 21,166 | 24,797
Non- Accrual Loans | 120 | 115 |
90 Days or More Past Due and Accruing | 92 |  |
Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 8 | 14 |
Current | 11,724 | 12,226 |
Total loans | 11,732 | 12,240 | $ 12,372
90 Days or More Past Due and Accruing | 5 |  |
30 - 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 1,893 | 3,523 |
30 - 59 Days Past Due [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 809 | 2,441 |
30 - 59 Days Past Due [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 773 | 504 |
30 - 59 Days Past Due [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 258 | 554 |
30 - 59 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 50 | 10 |
30 - 59 Days Past Due [Member] | Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 3 | 14 |
60 - 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 1,394 | 1,300 |
60 - 89 Days Past Due [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 595 | 71 |
60 - 89 Days Past Due [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 345 | 323 |
60 - 89 Days Past Due [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 454 | 800 |
60 - 89 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due |  | 106 |
> 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 3,066 | 3,273 |
> 90 Days Past Due [Member] | Secured by 1-4 Family Residential [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 384 | 754 |
> 90 Days Past Due [Member] | Other Real Estate Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 2,569 | $ 2,519 |
> 90 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | 108 |  |
> 90 Days Past Due [Member] | Consumer and Other Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans Past Due | $ 5 |  |

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