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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