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Loans - Aging of Recorded Investment in Past Due Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 2,820 $ 4,039
60-89 Days Past Due 1,035 4,207
Greater Than 90 Days Past Due 18,106 14,587
Total Past Due 21,961 22,833
Loans Not Past Due 960,986 904,991
Total 986,482 931,225
Commercial, Industrial, and Agricultural [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 135 724
60-89 Days Past Due 127 157
Greater Than 90 Days Past Due 2,531 2,968
Total Past Due 2,793 3,849
Loans Not Past Due 260,956 253,242
Total 263,749 257,091
Commercial Mortgages [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 1,162
60-89 Days Past Due 71 3,197
Greater Than 90 Days Past Due 13,177 8,679
Total Past Due 13,248 13,038
Loans Not Past Due 270,406 248,753
Total 283,654 261,791
Residential Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 2,153 1,390
60-89 Days Past Due 581 641
Greater Than 90 Days Past Due 2,184 2,700
Total Past Due 4,918 4,731
Loans Not Past Due 370,069 343,173
Total 374,987 347,904
Consumer [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 503 724
60-89 Days Past Due 231 203
Greater Than 90 Days Past Due 195 227
Total Past Due 929 1,154
Loans Not Past Due 54,254 54,113
Total 55,183 55,267
Credit Cards [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 29 39
60-89 Days Past Due 25 9
Greater Than 90 Days Past Due 19 13
Total Past Due 73 61
Loans Not Past Due 4,645 4,739
Total 4,718 4,800
Overdrafts [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 0
60-89 Days Past Due 0 0
Greater Than 90 Days Past Due 0 0
Total Past Due 0 0
Loans Not Past Due 656 971
Total $ 656 $ 971