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Loans - Aging of Recorded Investment in Past Due Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due $ 3,616 $ 6,019
60-89 Days Past Due 2,809 2,447
Greater Than 90 Days Past Due 10,155 11,766
Total Past Due 16,580 20,232
Loans Not Past Due 1,314,000 1,279,027
Total 1,330,580 1,299,259
Commercial, Industrial, and Agricultural [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 1,114 211
60-89 Days Past Due 834 542
Greater Than 90 Days Past Due 665 855
Total Past Due 2,613 1,608
Loans Not Past Due 421,446 426,107
Total 424,059 427,715
Commercial Mortgages [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 0 1,258
60-89 Days Past Due 1,160 713
Greater Than 90 Days Past Due 5,201 7,236
Total Past Due 6,361 9,207
Loans Not Past Due 332,084 334,258
Total 338,445 343,465
Residential Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 2,300 4,216
60-89 Days Past Due 689 114
Greater Than 90 Days Past Due 3,154 2,539
Total Past Due 6,143 6,869
Loans Not Past Due 488,656 452,245
Total 494,799 459,114
Consumer [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-59 Days Past Due 202 334
60-89 Days Past Due 70 1,049
Greater Than 90 Days Past Due 1,090 1,112
Total Past Due 1,362 2,495
Loans Not Past Due 66,391 60,996
Total 67,753 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 56 29
Greater Than 90 Days Past Due 45 24
Total Past Due 101 53
Loans Not Past Due 4,978 5,012
Total 5,079 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 445 409
Total $ 445 $ 409