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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 6,195 $ 4,571  
Current 524,738 517,630  
Total Loans 530,933 522,201 $ 503,833
Non-accrual Loans 2,330 937  
90 Days or More Past Due and Accruing 549 183  
30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,902 3,869  
60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 874 477  
90 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,419 225  
Real estate loans | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 525 1,056  
Current 36,825 34,871  
Total Loans 37,350 35,927 36,783
Non-accrual Loans 0 269  
90 Days or More Past Due and Accruing 355 40  
Real estate loans | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,869 957  
Current 209,232 207,220  
Total Loans 211,101 208,177 205,114
Non-accrual Loans 375 267  
90 Days or More Past Due and Accruing 76 106  
Real estate loans | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 3,332 2,222  
Current 221,030 220,034  
Total Loans 224,362 222,256 215,742
Non-accrual Loans 1,755 401  
90 Days or More Past Due and Accruing 0 10  
Real estate loans | 30-59 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 170 986  
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 1,218 606  
Real estate loans | 30-59 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,426 2,042  
Real estate loans | 60-89 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 30  
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 292 203  
Real estate loans | 60-89 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 319 170  
Real estate loans | 90 Days Past Due | Construction and land development      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 355 40  
Real estate loans | 90 Days Past Due | Secured by 1-4 family residential      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 359 148  
Real estate loans | 90 Days Past Due | Other real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,587 10  
Commercial and industrial loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 285 209  
Current 40,658 38,554  
Total Loans 40,943 38,763 31,201
Non-accrual Loans 200 0  
90 Days or More Past Due and Accruing 75 0  
Commercial and industrial loans | 30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 184  
Commercial and industrial loans | 60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 210 25  
Commercial and industrial loans | 90 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 75 0  
Consumer and other loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 184 127  
Current 16,993 16,951  
Total Loans 17,177 17,078 $ 14,993
Non-accrual Loans 0 0  
90 Days or More Past Due and Accruing 43 27  
Consumer and other loans | 30-59 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 88 51  
Consumer and other loans | 60-89 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 53 49  
Consumer and other loans | 90 Days Past Due      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 43 $ 27