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Allowance for Loan Losses - Aging Analysis of Past Due Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 8,754 $ 9,594
Current 991,521 905,263
Total Loans 1,000,275 914,857
Past Due 90 Days and Accruing 24  
Commercial and Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,261 245
Current 127,858 113,941
Total Loans 129,119 114,186
Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 591 1,530
Current 159,866 141,484
Total Loans 160,457 143,014
Commercial Real Estate Non Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,500 2,629
Current 339,202 306,037
Total Loans 340,702 308,666
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 4,671 4,991
Current 280,228 263,519
Total Loans 284,899 268,510
Real Estate Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 199 41
Current 67,262 65,411
Total Loans 67,461 65,452
Consumer and Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 532 158
Current 17,105 14,871
Total Loans 17,637 15,029
Past Due 90 Days and Accruing 24  
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,800 3,288
30-59 Days Past Due [Member] | Commercial and Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 34 58
30-59 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 161 622
30-59 Days Past Due [Member] | Commercial Real Estate Non Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 4 521
30-59 Days Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 912 1,923
30-59 Days Past Due [Member] | Real Estate Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 199 33
30-59 Days Past Due [Member] | Consumer and Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 490 131
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 2,784 985
60-89 Days Past Due [Member] | Commercial and Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 941  
60-89 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 37 251
60-89 Days Past Due [Member] | Commercial Real Estate Non Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   5
60-89 Days Past Due [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,788 721
60-89 Days Past Due [Member] | Consumer and Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 18 8
90 Days or Greater [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 4,170 5,321
90 Days or Greater [Member] | Commercial and Agriculture [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 286 187
90 Days or Greater [Member] | Commercial Real Estate Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 393 657
90 Days or Greater [Member] | Commercial Real Estate Non Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,496 2,103
90 Days or Greater [Member] | Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due 1,971 2,347
90 Days or Greater [Member] | Real Estate Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due   8
90 Days or Greater [Member] | Consumer and Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Past Due $ 24 $ 19