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Loans - Detailed Amount of Gross Loans Segregated by Loan Grade and Class (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans $ 420,722 $ 405,605
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 338,591 330,489
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 37,360 25,923
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 15,889 16,905
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 88,627 95,925
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 196,715 191,736
Real Estate Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 67,381 59,126
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 66,382 58,204
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 999 922
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 14,750 15,990
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,342 1,310
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 13,408 14,680
Satisfactory 1, 2, 3, 4 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 365,028 336,366
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 286,291 264,714
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 35,479 23,720
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 14,488 15,496
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 78,362 82,227
Satisfactory 1, 2, 3, 4 [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 157,962 143,271
Satisfactory 1, 2, 3, 4 [Member] | Real Estate Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 64,238 55,934
Satisfactory 1, 2, 3, 4 [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 63,280 55,081
Satisfactory 1, 2, 3, 4 [Member] | Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 958 853
Satisfactory 1, 2, 3, 4 [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 14,499 15,718
Satisfactory 1, 2, 3, 4 [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,332 1,304
Satisfactory 1, 2, 3, 4 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 13,167 14,414
Special Mention 5,6 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 33,398 53,011
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 32,314 49,941
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 881 2,116
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 367 377
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 2,482 5,615
Special Mention 5,6 [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 28,584 41,833
Special Mention 5,6 [Member] | Real Estate Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,000 2,999
Special Mention 5,6 [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 995 2,990
Special Mention 5,6 [Member] | Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 5 9
Special Mention 5,6 [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 84 71
Special Mention 5,6 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 84 71
Substandard 7 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 22,238 16,170
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 19,986 15,834
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,000 87
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 1,034 1,032
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 7,783 8,083
Substandard 7 [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 10,169 6,632
Substandard 7 [Member] | Real Estate Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 2,143 193
Substandard 7 [Member] | Real Estate Loans [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 2,107 133
Substandard 7 [Member] | Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 36 60
Substandard 7 [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 109 143
Substandard 7 [Member] | Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 10 6
Substandard 7 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 99 137
Doubtful 8 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 58 58
Doubtful 8 [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans 58 58
Doubtful 8 [Member] | Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total gross loans $ 58 $ 58