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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 2,200 $ 4,444  
Current 548,275 538,412  
Total Loans 550,475 542,856 $ 520,936
Non-accrual Loans 1,915 3,172  
90 Days or More Past Due and Accruing 133 235  
30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 964 1,070  
60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 86 534  
90 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,150 2,840  
Real estate loans | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 80 168  
Current 48,868 45,699  
Total Loans 48,948 45,867 33,941
Non-accrual Loans 398 327  
90 Days or More Past Due and Accruing 0 0  
Real estate loans | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,068 1,563  
Current 216,459 214,382  
Total Loans 217,527 215,945 208,338
Non-accrual Loans 989 663  
90 Days or More Past Due and Accruing 115 0  
Real estate loans | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 880 2,388  
Current 220,516 217,165  
Total Loans 221,396 219,553 222,352
Non-accrual Loans 528 1,985  
90 Days or More Past Due and Accruing 0 222  
Real estate loans | 30-59 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 88  
Real estate loans | 30-59 Days Past Due | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 493 747  
Real estate loans | 30-59 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 403 145  
Real estate loans | 60-89 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 80  
Real estate loans | 60-89 Days Past Due | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 393  
Real estate loans | 60-89 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 36  
Real estate loans | 90 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 80 0  
Real estate loans | 90 Days Past Due | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 575 423  
Real estate loans | 90 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 477 2,207  
Commercial and industrial loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 58 235  
Current 45,987 44,370  
Total Loans 46,045 44,605 39,253
Non-accrual Loans 0 197  
90 Days or More Past Due and Accruing 2 13  
Commercial and industrial loans | 30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 54 0  
Commercial and industrial loans | 60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2 25  
Commercial and industrial loans | 90 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2 210  
Consumer and other loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 114 90  
Current 16,445 16,796  
Total Loans 16,559 16,886 $ 17,052
Non-accrual Loans 0 0  
90 Days or More Past Due and Accruing 16 0  
Consumer and other loans | 30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 14 90  
Consumer and other loans | 60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 84 0  
Consumer and other loans | 90 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 16 $ 0