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Loans - Aging Analysis of Past Due Loans, Segregated by Class (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due $ 5,428 $ 6,114
Total Past Due Loans 7,353 6,982
Current Loans 413,369 398,623
Total Gross Loans 420,722 405,605
Accruing Loans 90 or more Days Past Due 18 813
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due 4,923 5,616
Total Past Due Loans 6,780 6,478
Current Loans 331,811 324,011
Total Gross Loans 338,591 330,489
Accruing Loans 90 or more Days Past Due   807
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due 16 281
Total Past Due Loans 436 281
Current Loans 36,924 25,642
Total Gross Loans 37,360 25,923
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due 294 93
Total Past Due Loans 326 93
Current Loans 15,563 16,812
Total Gross Loans 15,889 16,905
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due 1,978 2,657
Total Past Due Loans 2,233 2,657
Current Loans 86,394 93,268
Total Gross Loans 88,627 95,925
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due 2,635 2,585
Total Past Due Loans 3,785 3,447
Current Loans 192,930 188,289
Total Gross Loans 196,715 191,736
Accruing Loans 90 or more Days Past Due   807
Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due 154 51
Total Past Due Loans 154 51
Current Loans 67,227 59,075
Total Gross Loans 67,381 59,126
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due 154 32
Total Past Due Loans 154 32
Current Loans 66,228 58,172
Total Gross Loans 66,382 58,204
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due   19
Total Past Due Loans   19
Current Loans 999 903
Total Gross Loans 999 922
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due 351 447
Total Past Due Loans 419 453
Current Loans 14,331 15,537
Total Gross Loans 14,750 15,990
Accruing Loans 90 or more Days Past Due 18 6
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due 40 25
Total Past Due Loans 50 31
Current Loans 1,292 1,279
Total Gross Loans 1,342 1,310
Accruing Loans 90 or more Days Past Due 10 6
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-89 Days Past Due 311 422
Total Past Due Loans 369 422
Current Loans 13,039 14,258
Total Gross Loans 13,408 14,680
Accruing Loans 90 or more Days Past Due 8  
Loans 90 or more Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Loans 1,925 868
Loans 90 or more Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Loans 1,857 862
Loans 90 or more Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Loans 420  
Loans 90 or more Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Loans 32  
Loans 90 or more Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Loans 255  
Loans 90 or more Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Loans 1,150 862
Loans 90 or more Days Past Due [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Loans 68 6
Loans 90 or more Days Past Due [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Loans 10 $ 6
Loans 90 or more Days Past Due [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due Loans $ 58