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Loans - Aging of Recorded Investment in Past Due Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 11,044 $ 6,019
60-89 Days Past Due 1,747 2,447
Greater Than 90 Days Past Due 11,907 11,766
Total Past Due 24,698 20,232
Loans Not Past Due 1,273,176 1,279,027
Total 1,297,874 1,299,259
Commercial, Industrial, and Agricultural [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 941 211
60-89 Days Past Due 973 542
Greater Than 90 Days Past Due 3,717 855
Total Past Due 5,631 1,608
Loans Not Past Due 355,509 356,107
Total 361,140 357,715
Commercial Mortgages [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 5,978 1,258
60-89 Days Past Due 404 713
Greater Than 90 Days Past Due 4,067 7,236
Total Past Due 10,449 9,207
Loans Not Past Due 399,311 404,258
Total 409,760 413,465
Residential Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 3,982 4,216
60-89 Days Past Due 269 114
Greater Than 90 Days Past Due 3,131 2,539
Total Past Due 7,382 6,869
Loans Not Past Due 452,285 452,245
Total 459,667 459,114
Consumer [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 143 334
60-89 Days Past Due 46 1,049
Greater Than 90 Days Past Due 953 1,112
Total Past Due 1,142 2,495
Loans Not Past Due 60,865 60,996
Total 62,007 63,491
Credit Cards [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 0
60-89 Days Past Due 55 29
Greater Than 90 Days Past Due 39 24
Total Past Due 94 53
Loans Not Past Due 4,785 5,012
Total 4,879 5,065
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 421 409
Total $ 421 $ 409