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Loans - Summary of Loan Classes and an Aging of Past Due Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 4,444 $ 4,571
Current 538,412 517,630
Total Loans 542,856 522,201
Non- Accrual Loans 3,172 937
90 Days or More Past Due and Accruing 235 183
30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,070 3,869
60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 534 477
90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,840 225
Real estate loans | Construction and land development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 168 1,056
Current 45,699 34,871
Total Loans 45,867 35,927
Non- Accrual Loans 327 269
90 Days or More Past Due and Accruing 0 40
Real estate loans | Construction and land development | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 88 986
Real estate loans | Construction and land development | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 80 30
Real estate loans | Construction and land development | 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 40
Real estate loans | Secured by 1-4 family residential    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,563 957
Current 214,382 207,220
Total Loans 215,945 208,177
Non- Accrual Loans 663 267
90 Days or More Past Due and Accruing 0 106
Real estate loans | Secured by 1-4 family residential | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 747 606
Real estate loans | Secured by 1-4 family residential | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 393 203
Real estate loans | Secured by 1-4 family residential | 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 423 148
Real estate loans | Other real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,388 2,222
Current 217,165 220,034
Total Loans 219,553 222,256
Non- Accrual Loans 1,985 401
90 Days or More Past Due and Accruing 222 10
Real estate loans | Other real estate | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 145 2,042
Real estate loans | Other real estate | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 36 170
Real estate loans | Other real estate | 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,207 10
Commercial and industrial loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 235 209
Current 44,370 38,554
Total Loans 44,605 38,763
Non- Accrual Loans 197 0
90 Days or More Past Due and Accruing 13 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 25 25
Commercial and industrial loans | 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 210 0
Consumer and other loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 90 127
Current 16,796 16,951
Total Loans 16,886 17,078
Non- Accrual Loans 0 0
90 Days or More Past Due and Accruing 0 27
Consumer and other loans | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 90 51
Consumer and other loans | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 0 49
Consumer and other loans | 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 0 $ 27