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Loans - Impaired Loans, Segregated by Class of Loans (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 7,610,000 $ 7,669,000
Recorded Investment With No Allowance 3,045,000 3,206,000
Recorded Investment With Allowance 4,565,000 4,463,000
Total Recorded Investment 7,609,500 7,668,908
Related Allowance 528,937 442,589
Average Recorded Investment 7,640,000 6,162,000
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 7,610,000 7,619,000
Recorded Investment With No Allowance 3,045,000 3,156,000
Recorded Investment With Allowance 4,565,000 4,463,000
Total Recorded Investment 7,610,000 7,619,000
Related Allowance 529,000 443,000
Average Recorded Investment 7,615,000 6,137,000
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 420,000 222,000
Recorded Investment With No Allowance   0
Recorded Investment With Allowance 420,000 222,000
Total Recorded Investment 420,000 222,000
Related Allowance 112,000  
Average Recorded Investment 321,000 111,000
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 272,000 252,000
Recorded Investment With No Allowance 272,000 252,000
Total Recorded Investment 272,000 252,000
Average Recorded Investment 262,000 126,000
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 1,232,000 1,344,000
Recorded Investment With No Allowance 1,034,000 1,141,000
Recorded Investment With Allowance 198,000 203,000
Total Recorded Investment 1,232,000 1,344,000
Related Allowance 33,000 46,000
Average Recorded Investment 1,288,000 906,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 5,686,000 5,801,000
Recorded Investment With No Allowance 1,739,000 1,763,000
Recorded Investment With Allowance 3,947,000 4,038,000
Total Recorded Investment 5,686,000 5,801,000
Related Allowance 384,000 397,000
Average Recorded Investment 5,744,000 4,994,000
Real Estate Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance   50,000
Recorded Investment With No Allowance   50,000
Total Recorded Investment   50,000
Average Recorded Investment 25,000 25,000
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance   50,000
Recorded Investment With No Allowance   50,000
Total Recorded Investment   50,000
Average Recorded Investment $ 25,000 $ 25,000