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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due $ 3,025 $ 2,564
Current 483,042 436,435
Total loans 486,067 438,999
Non- Accrual Loans 1,520 3,854
90 Days or More Past Due and Accruing 116 92
Construction and Land Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 40  
Current 34,659 33,135
Total loans 34,699 33,135
Non- Accrual Loans 1,033 1,269
Secured by 1-4 Family Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 1,560 917
Current 197,203 188,369
Total loans 198,763 189,286
Non- Accrual Loans 413 346
90 Days or More Past Due and Accruing 84  
Other Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 1,022 1,535
Current 210,188 179,912
Total loans 211,210 181,447
Non- Accrual Loans 74 2,145
Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 377 92
Current 29,604 23,956
Total loans 29,981 24,048
Non- Accrual Loans   94
90 Days or More Past Due and Accruing 32 92
Consumer and Other Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 26 20
Current 11,388 11,063
Total loans 11,414 11,083
30 - 59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 1,356 1,042
30 - 59 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 980 635
30 - 59 Days Past Due [Member] | Other Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 321 387
30 - 59 Days Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 36  
30 - 59 Days Past Due [Member] | Consumer and Other Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 19 20
60 - 89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 1,227 376
60 - 89 Days Past Due [Member] | Construction and Land Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 40  
60 - 89 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 170 18
60 - 89 Days Past Due [Member] | Other Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 701 358
60 - 89 Days Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 309  
60 - 89 Days Past Due [Member] | Consumer and Other Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 7  
> 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 442 1,146
> 90 Days Past Due [Member] | Secured by 1-4 Family Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due 410 264
> 90 Days Past Due [Member] | Other Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due   790
> 90 Days Past Due [Member] | Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans Past Due $ 32 $ 92