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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | $ 2,564 | $ 8,096
Current | 436,435 | 370,314
Total loans | 438,999 | 378,410
Non- Accrual Loans | 3,854 | 8,000
90 Days or More Past Due and Accruing | 92 |
Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due |  | 2,512
Current | 33,135 | 26,963
Total loans | 33,135 | 29,475
Non- Accrual Loans | 1,269 | 1,787
Secured by 1-4 Family Residential [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | 917 | 1,581
Current | 188,369 | 162,146
Total loans | 189,286 | 163,727
Non- Accrual Loans | 346 | 1,342
Other Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | 1,535 | 3,873
Current | 179,912 | 147,929
Total loans | 181,447 | 151,802
Non- Accrual Loans | 2,145 | 4,756
Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | 92 | 116
Current | 23,956 | 21,050
Total loans | 24,048 | 21,166
Non- Accrual Loans | 94 | 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 | 20 | 14
Current | 11,063 | 12,226
Total loans | 11,083 | 12,240
30 - 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | 1,042 | 3,523
30 - 59 Days Past Due [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due |  | 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 | 635 | 504
30 - 59 Days Past Due [Member] | Other Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | 387 | 554
30 - 59 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due |  | 10
30 - 59 Days Past Due [Member] | Consumer and Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | 20 | 14
60 - 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | 376 | 1,300
60 - 89 Days Past Due [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due |  | 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 | 18 | 323
60 - 89 Days Past Due [Member] | Other Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | 358 | 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 | 1,146 | 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 | 264 | 754
> 90 Days Past Due [Member] | Other Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | 790 | $ 2,519
> 90 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Past Due | $ 92 |

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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + 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 (d) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 + Details
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