v2.4.0.6
Aging of Recorded Investment in Past Due Loans by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due$ 7,051$ 14,567
Loans over 90 days past due195219
Nonaccrual16,26515,651
Loans not past due1,121,7191,100,964
Total1,145,2301,131,401
Commercial
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due498692
Loans over 90 days past due074
Nonaccrual1,0741,175
Loans not past due180,360191,235
Total181,932193,176
Residential real estate
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Total280,135266,268
Residential real estate | Home Equity Line of Credit
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due2411,094
Loans over 90 days past due00
Nonaccrual1,095910
Loans not past due100,24492,676
Total101,58094,680
Residential real estate | Multi Family
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due00
Loans over 90 days past due00
Nonaccrual4480
Loans not past due42,90836,756
Total43,35636,756
Residential real estate | Residential Real Estate Other Financing Receivable
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due1,0555,854
Loans over 90 days past due0112
Nonaccrual4,3884,415
Loans not past due129,756124,451
Total135,199134,832
Nonresidential real estate
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Total539,748523,485
Nonresidential real estate | Commercial Mortgage Loans, Owner Occupied
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due1,7472,623
Loans over 90 days past due00
Nonaccrual1,6532,270
Loans not past due263,562247,875
Total266,962252,768
Nonresidential real estate | Commercial Mortgage Loans, Non Owner Occupied
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due3,3693,942
Loans over 90 days past due1260
Nonaccrual3,5834,358
Loans not past due265,708262,417
Total272,786270,717
Construction
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due78265
Loans over 90 days past due00
Nonaccrual3,7981,897
Loans not past due96,218102,626
Total100,094104,788
Consumer
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Total16,30716,618
Consumer | Consumer Credit Card Financing Receivable
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due2060
Loans over 90 days past due6832
Nonaccrual00
Loans not past due6,2396,400
Total6,3276,492
Consumer | Consumer Other Financing Receivable
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due4337
Loans over 90 days past due11
Nonaccrual226626
Loans not past due9,7109,462
Total9,98010,126
Municipal Obligations
  
Financing Receivable, Recorded Investment, Past Due [Line Items]  
Loans 30-90 days past due0 
Loans over 90 days past due00
Nonaccrual00
Loans not past due27,01427,066
Total$ 27,014$ 27,066