v2.4.0.6
Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Assets  
Impaired loans$ 1,129,064$ 1,112,788
Fair Value, Measurements, Nonrecurring
  
Assets  
Impaired loans24,17021,680
Fair Value, Measurements, Nonrecurring | Construction
  
Assets  
Impaired loans3,4933,787
Fair Value, Measurements, Nonrecurring | Impaired Loans | Commercial
  
Assets  
Impaired loans419383
Fair Value, Measurements, Nonrecurring | Impaired Loans | Nonresidential real estate
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Commercial Mortgage Loans, Owner Occupied | Nonresidential real estate
  
Assets  
Impaired loans7,8848,320
Fair Value, Measurements, Nonrecurring | Commercial Mortgage Loans, Non Owner Occupied | Nonresidential real estate
  
Assets  
Impaired loans7,6695,858
Fair Value, Measurements, Nonrecurring | Home Equity Line of Credit | Residential real estate
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Multi Family | Residential real estate
  
Assets  
Impaired loans1,5430
Fair Value, Measurements, Nonrecurring | Residential Real Estate Other Financing Receivable | Residential real estate
  
Assets  
Impaired loans3,1623,332
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Construction
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired Loans | Commercial
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Mortgage Loans, Owner Occupied | Nonresidential real estate
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Mortgage Loans, Non Owner Occupied | Nonresidential real estate
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Home Equity Line of Credit | Residential real estate
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Multi Family | Residential real estate
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential Real Estate Other Financing Receivable | Residential real estate
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2)
  
Assets  
Impaired loans7,0592,421
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Construction
  
Assets  
Impaired loans2,801214
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Impaired Loans | Commercial
  
Assets  
Impaired loans750
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Loans, Owner Occupied | Nonresidential real estate
  
Assets  
Impaired loans6050
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Loans, Non Owner Occupied | Nonresidential real estate
  
Assets  
Impaired loans906375
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Home Equity Line of Credit | Residential real estate
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Multi Family | Residential real estate
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Residential Real Estate Other Financing Receivable | Residential real estate
  
Assets  
Impaired loans2,6721,832
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3)
  
Assets  
Impaired loans17,11119,259
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Construction
  
Assets  
Impaired loans6923,573
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Impaired Loans | Commercial
  
Assets  
Impaired loans344383
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Commercial Mortgage Loans, Owner Occupied | Nonresidential real estate
  
Assets  
Impaired loans7,2798,320
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Commercial Mortgage Loans, Non Owner Occupied | Nonresidential real estate
  
Assets  
Impaired loans6,7635,483
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Home Equity Line of Credit | Residential real estate
  
Assets  
Impaired loans00
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Multi Family | Residential real estate
  
Assets  
Impaired loans1,5430
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Residential Real Estate Other Financing Receivable | Residential real estate
  
Assets  
Impaired loans$ 490$ 1,500