v2.4.0.6
Risk Category of Loans by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]    
Gross loans $ 1,160,531 $ 1,131,401
Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 181,170 193,176
Residential Real Estate [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 281,745 266,268
Residential Real Estate [Member] | Home Equity Line of Credit [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 100,292 94,680
Residential Real Estate [Member] | Multi Family [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 46,783 36,756
Residential Real Estate [Member] | Residential Real Estate Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 134,670 134,832
Nonresidential Real Estate [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 555,234 523,485
Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 278,199 252,768
Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Non Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 277,035 270,717
Construction [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 98,609 104,788
Consumer [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 16,170 16,618
Consumer [Member] | Consumer Credit Card Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 6,497 6,492
Consumer [Member] | Consumer Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 9,673 10,126
Municipal Obligations [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 27,603 27,066
Pass [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 883,504 831,152
Pass [Member] | Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 166,935 170,394
Pass [Member] | Residential Real Estate [Member] | Home Equity Line of Credit [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 11,827 0
Pass [Member] | Residential Real Estate [Member] | Multi Family [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 45,311 36,115
Pass [Member] | Residential Real Estate [Member] | Residential Real Estate Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 40,607 38,725
Pass [Member] | Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 248,156 221,941
Pass [Member] | Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Non Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 255,141 246,614
Pass [Member] | Construction [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 87,924 90,297
Pass [Member] | Consumer [Member] | Consumer Credit Card Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Pass [Member] | Consumer [Member] | Consumer Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Pass [Member] | Municipal Obligations [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 27,603 27,066
Special Mention [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 32,949 31,910
Special Mention [Member] | Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 10,448 9,684
Special Mention [Member] | Residential Real Estate [Member] | Home Equity Line of Credit [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 781 712
Special Mention [Member] | Residential Real Estate [Member] | Multi Family [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 100 103
Special Mention [Member] | Residential Real Estate [Member] | Residential Real Estate Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 1,143 1,357
Special Mention [Member] | Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 10,909 7,754
Special Mention [Member] | Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Non Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 7,304 8,902
Special Mention [Member] | Construction [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 2,264 3,398
Special Mention [Member] | Consumer [Member] | Consumer Credit Card Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Special Mention [Member] | Consumer [Member] | Consumer Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Special Mention [Member] | Municipal Obligations [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Substandard [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 59,772 74,844
Substandard [Member] | Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 3,787 13,098
Substandard [Member] | Residential Real Estate [Member] | Home Equity Line of Credit [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 1,953 976
Substandard [Member] | Residential Real Estate [Member] | Multi Family [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 1,372 538
Substandard [Member] | Residential Real Estate [Member] | Residential Real Estate Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 10,496 10,843
Substandard [Member] | Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 19,134 23,073
Substandard [Member] | Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Non Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 14,590 15,201
Substandard [Member] | Construction [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 8,421 11,093
Substandard [Member] | Consumer [Member] | Consumer Credit Card Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Substandard [Member] | Consumer [Member] | Consumer Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 19 22
Substandard [Member] | Municipal Obligations [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Doubtful [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 84
Doubtful [Member] | Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Doubtful [Member] | Residential Real Estate [Member] | Home Equity Line of Credit [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 84
Doubtful [Member] | Residential Real Estate [Member] | Multi Family [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Doubtful [Member] | Residential Real Estate [Member] | Residential Real Estate Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Doubtful [Member] | Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Doubtful [Member] | Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Non Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Doubtful [Member] | Construction [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Doubtful [Member] | Consumer [Member] | Consumer Credit Card Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Doubtful [Member] | Consumer [Member] | Consumer Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Doubtful [Member] | Municipal Obligations [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 0
Not Rated [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 184,306 [1] 193,411 [1]
Not Rated [Member] | Commercial [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 [1] 0 [1]
Not Rated [Member] | Residential Real Estate [Member] | Home Equity Line of Credit [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 85,731 [1] 92,908 [1]
Not Rated [Member] | Residential Real Estate [Member] | Multi Family [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 [1] 0 [1]
Not Rated [Member] | Residential Real Estate [Member] | Residential Real Estate Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 82,424 [1] 83,907 [1]
Not Rated [Member] | Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 [1] 0 [1]
Not Rated [Member] | Nonresidential Real Estate [Member] | Commercial Mortgage Loans, Non Owner Occupied [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 [1] 0 [1]
Not Rated [Member] | Construction [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 0 [1] 0 [1]
Not Rated [Member] | Consumer [Member] | Consumer Credit Card Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 6,497 [1] 6,492 [1]
Not Rated [Member] | Consumer [Member] | Consumer Other Financing Receivable [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 9,654 [1] 10,104 [1]
Not Rated [Member] | Municipal Obligations [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Gross loans $ 0 [1] $ 0 [1]
[1] Not rated loans represent the homogenous pools risk category.