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Loans - Impaired Loans, Segregated by Class of Loans (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance $ 15,583,000 $ 13,079,000
Recorded Investment With No Allowance 3,296,000 2,835,000
Recorded Investment With Allowance 12,286,822 10,243,082
Total Recorded Investment 15,583,000 13,079,000
Related Allowance 2,996,708 2,024,754
Average Recorded Investment 14,332,000 13,335,000
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 15,519,000 12,888,000
Recorded Investment With No Allowance 3,232,000 2,684,000
Recorded Investment With Allowance 12,287,000 10,204,000
Total Recorded Investment 15,519,000 12,888,000
Related Allowance 2,997,000 1,985,000
Average Recorded Investment 14,205,000 12,068,000
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 75,000 92,000
Recorded Investment With Allowance 75,000 92,000
Total Recorded Investment 75,000 92,000
Related Allowance 75,000 92,000
Average Recorded Investment 85,000 114,000
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 679,000 798,000
Recorded Investment With No Allowance 69,000 104,000
Recorded Investment With Allowance 610,000 694,000
Total Recorded Investment 679,000 798,000
Related Allowance 54,000 108,000
Average Recorded Investment 739,000 575,000
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 3,103,000 2,554,000
Recorded Investment With No Allowance 1,754,000 1,685,000
Recorded Investment With Allowance 1,349,000 869,000
Total Recorded Investment 3,103,000 2,554,000
Related Allowance 183,000 143,000
Average Recorded Investment 2,829,000 2,210,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 11,662,000 9,444,000
Recorded Investment With No Allowance 1,409,000 895,000
Recorded Investment With Allowance 10,253,000 8,549,000
Total Recorded Investment 11,662,000 9,444,000
Related Allowance 2,685,000 1,642,000
Average Recorded Investment 10,552,000 9,169,000
Real Estate Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 28,000 70,000
Recorded Investment With No Allowance 28,000 30,000
Recorded Investment With Allowance   40,000
Total Recorded Investment 28,000 70,000
Related Allowance   40,000
Average Recorded Investment 49,000 1,147,000
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 28,000 70,000
Recorded Investment With No Allowance 28,000 30,000
Recorded Investment With Allowance   40,000
Total Recorded Investment 28,000 70,000
Related Allowance   40,000
Average Recorded Investment 49,000 1,147,000
Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 36,000 121,000
Recorded Investment With No Allowance 36,000 121,000
Total Recorded Investment 36,000 121,000
Average Recorded Investment 78,000 120,000
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Unpaid Principal Balance 36,000 121,000
Recorded Investment With No Allowance 36,000 121,000
Total Recorded Investment 36,000 121,000
Average Recorded Investment $ 78,000 $ 120,000