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Loans - Period-End Non-Accrual Loans, Segregated by Class (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans $ 7,083 $ 7,582
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans 6,898 7,388
Commercial Real Estate Portfolio Segment [Member] | Land Development And Construction Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans 420  
Commercial Real Estate Portfolio Segment [Member] | Farmland Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans 272 366
Commercial Real Estate Portfolio Segment [Member] | 1-4 Family Mortgages [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans 1,927 2,131
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans 4,279 4,891
Real Estate Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans 114 110
Real Estate Loans [Member] | Farm Production and Other Farm Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans 31 32
Real Estate Loans [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans 83 78
Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans 71 84
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Non-accrual Loans $ 71 $ 84