v2.4.0.6
Aging of Recorded Investment in Past Due Loans by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due $ 11,448 $ 14,567
Loans over 90 days past due 105 219
Nonaccrual 14,813 15,651
Loans not past due 1,134,165 1,100,964
Total 1,160,531 1,131,401
Commercial [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due 599 692
Loans over 90 days past due 0 74
Nonaccrual 968 1,175
Loans not past due 179,603 191,235
Total 181,170 193,176
Residential Real Estate [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total 281,745 266,268
Residential Real Estate [Member] | Home Equity Line of Credit [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due 827 1,094
Loans over 90 days past due 39 0
Nonaccrual 768 910
Loans not past due 98,658 92,676
Total 100,292 94,680
Residential Real Estate [Member] | Multi Family [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due 111 0
Loans over 90 days past due 0 0
Nonaccrual 48 0
Loans not past due 46,624 36,756
Total 46,783 36,756
Residential Real Estate [Member] | Residential Real Estate Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due 3,657 5,854
Loans over 90 days past due 0 112
Nonaccrual 3,676 4,415
Loans not past due 127,337 124,451
Total 134,670 134,832
Nonresidential Real Estate [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total 555,234 523,485
Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Owner Occupied [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due 3,591 2,623
Loans over 90 days past due 0 0
Nonaccrual 1,368 2,270
Loans not past due 273,240 247,875
Total 278,199 252,768
Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Non Owner Occupied [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due 1,881 3,942
Loans over 90 days past due 0 0
Nonaccrual 6,305 4,358
Loans not past due 268,849 262,417
Total 277,035 270,717
Construction [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due 737 265
Loans over 90 days past due 0 0
Nonaccrual 1,601 1,897
Loans not past due 96,271 102,626
Total 98,609 104,788
Consumer [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total 16,170 16,618
Consumer [Member] | Consumer Credit Card Financing Receivable [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due 32 60
Loans over 90 days past due 66 32
Nonaccrual 0 0
Loans not past due 6,399 6,400
Total 6,497 6,492
Consumer [Member] | Consumer Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due 13 37
Loans over 90 days past due 0 1
Nonaccrual 79 626
Loans not past due 9,581 9,462
Total 9,673 10,126
Municipal Obligations [Member]
   
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 30-90 days past due 0  
Loans over 90 days past due 0 0
Nonaccrual 0 0
Loans not past due 27,603 27,066
Total $ 27,603 $ 27,066