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Loans - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment $ 427 $ 753    
Allowance for loan losses, Collectively evaluated for impairment 14,352 12,208    
Acquired with deteriorated credit quality 0      
Allowance for loan losses, Modified in a troubled debt restructuring 1,455 1,099    
Total ending allowance balance 16,234 14,060 12,615 10,820
Loans:        
Loans individually evaluated for impairment 6,172 13,899    
Loans collectively evaluated for impairment 1,278,726 905,705    
Acquired with deteriorated credit quality 2,225      
Loans modified in a troubled debt restructuring 12,136 11,621    
Total ending loans balance 1,299,259 931,225    
Commercial, Industrial, and Agricultural [Member]
        
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment 372 541    
Allowance for loan losses, Collectively evaluated for impairment 5,907 4,399    
Acquired with deteriorated credit quality 0      
Allowance for loan losses, Modified in a troubled debt restructuring 0 0    
Total ending allowance balance 6,279 4,940 4,511 3,517
Loans:        
Loans individually evaluated for impairment 4,923 2,623    
Loans collectively evaluated for impairment 285,518 253,048    
Acquired with deteriorated credit quality 0      
Loans modified in a troubled debt restructuring 1,263 1,420    
Total ending loans balance 291,704 257,091    
Commercial Mortgages [Member]
        
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment 55 131    
Allowance for loan losses, Collectively evaluated for impairment 3,959 3,467    
Acquired with deteriorated credit quality 0      
Allowance for loan losses, Modified in a troubled debt restructuring 1,455 1,099    
Total ending allowance balance 5,469 4,697 4,470 3,511
Loans:        
Loans individually evaluated for impairment 1,249 10,683    
Loans collectively evaluated for impairment 452,945 240,907    
Acquired with deteriorated credit quality 2,225      
Loans modified in a troubled debt restructuring 10,873 10,201    
Total ending loans balance 467,292 261,791    
Residential Real Estate [Member]
        
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment 0 81    
Allowance for loan losses, Collectively evaluated for impairment 2,880 2,385    
Acquired with deteriorated credit quality 0      
Allowance for loan losses, Modified in a troubled debt restructuring 0 0    
Total ending allowance balance 2,880 2,466 1,991 1,916
Loans:        
Loans individually evaluated for impairment 0 593    
Loans collectively evaluated for impairment 471,298 347,311    
Acquired with deteriorated credit quality 0      
Loans modified in a troubled debt restructuring 0 0    
Total ending loans balance 471,298 347,904    
Consumer [Member]
        
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment 0 0    
Allowance for loan losses, Collectively evaluated for impairment 1,333 1,699    
Acquired with deteriorated credit quality 0      
Allowance for loan losses, Modified in a troubled debt restructuring 0 0    
Total ending allowance balance 1,333 1,699 1,404 1,561
Loans:        
Loans individually evaluated for impairment 0 0    
Loans collectively evaluated for impairment 63,491 58,668    
Acquired with deteriorated credit quality 0      
Loans modified in a troubled debt restructuring 0 0    
Total ending loans balance 63,491 58,668    
Credit Cards [Member]
        
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment 0 0    
Allowance for loan losses, Collectively evaluated for impairment 66 83    
Acquired with deteriorated credit quality 0      
Allowance for loan losses, Modified in a troubled debt restructuring 0 0    
Total ending allowance balance 66 83 71 96
Loans:        
Loans individually evaluated for impairment 0 0    
Loans collectively evaluated for impairment 5,065 4,800    
Acquired with deteriorated credit quality 0      
Loans modified in a troubled debt restructuring 0 0    
Total ending loans balance 5,065 4,800    
Overdrafts [Member]
        
Ending allowance balance attributable to loans:        
Allowance for loan losses, Individually evaluated for impairment 0 0    
Allowance for loan losses, Collectively evaluated for impairment 207 175    
Acquired with deteriorated credit quality 0      
Allowance for loan losses, Modified in a troubled debt restructuring 0 0    
Total ending allowance balance 207 175 168 219
Loans:        
Loans individually evaluated for impairment 0 0    
Loans collectively evaluated for impairment 409 971    
Acquired with deteriorated credit quality 0      
Loans modified in a troubled debt restructuring 0 0    
Total ending loans balance $ 409 $ 971