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 loans | 24,170 | 21,680 |
Fair Value, Measurements, Nonrecurring | Construction | ||
| Assets | ||
| Impaired loans | 3,493 | 3,787 |
Fair Value, Measurements, Nonrecurring | Impaired Loans | Commercial | ||
| Assets | ||
| Impaired loans | 419 | 383 |
Fair Value, Measurements, Nonrecurring | Impaired Loans | Nonresidential real estate | ||
| Assets | ||
| Impaired loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Commercial Mortgage Loans, Owner Occupied | Nonresidential real estate | ||
| Assets | ||
| Impaired loans | 7,884 | 8,320 |
Fair Value, Measurements, Nonrecurring | Commercial Mortgage Loans, Non Owner Occupied | Nonresidential real estate | ||
| Assets | ||
| Impaired loans | 7,669 | 5,858 |
Fair Value, Measurements, Nonrecurring | Home Equity Line of Credit | Residential real estate | ||
| Assets | ||
| Impaired loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Multi Family | Residential real estate | ||
| Assets | ||
| Impaired loans | 1,543 | 0 |
Fair Value, Measurements, Nonrecurring | Residential Real Estate Other Financing Receivable | Residential real estate | ||
| Assets | ||
| Impaired loans | 3,162 | 3,332 |
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | ||
| Assets | ||
| Impaired loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Construction | ||
| Assets | ||
| Impaired loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired Loans | Commercial | ||
| Assets | ||
| Impaired loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Mortgage Loans, Owner Occupied | Nonresidential real estate | ||
| Assets | ||
| Impaired loans | 0 | 0 |
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 loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Home Equity Line of Credit | Residential real estate | ||
| Assets | ||
| Impaired loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Multi Family | Residential real estate | ||
| Assets | ||
| Impaired loans | 0 | 0 |
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 loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | ||
| Assets | ||
| Impaired loans | 7,059 | 2,421 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Construction | ||
| Assets | ||
| Impaired loans | 2,801 | 214 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Impaired Loans | Commercial | ||
| Assets | ||
| Impaired loans | 75 | 0 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Loans, Owner Occupied | Nonresidential real estate | ||
| Assets | ||
| Impaired loans | 605 | 0 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Commercial Mortgage Loans, Non Owner Occupied | Nonresidential real estate | ||
| Assets | ||
| Impaired loans | 906 | 375 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Home Equity Line of Credit | Residential real estate | ||
| Assets | ||
| Impaired loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Multi Family | Residential real estate | ||
| Assets | ||
| Impaired loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Significant Other Observable Inputs (Level 2) | Residential Real Estate Other Financing Receivable | Residential real estate | ||
| Assets | ||
| Impaired loans | 2,672 | 1,832 |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | ||
| Assets | ||
| Impaired loans | 17,111 | 19,259 |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Construction | ||
| Assets | ||
| Impaired loans | 692 | 3,573 |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Impaired Loans | Commercial | ||
| Assets | ||
| Impaired loans | 344 | 383 |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Commercial Mortgage Loans, Owner Occupied | Nonresidential real estate | ||
| Assets | ||
| Impaired loans | 7,279 | 8,320 |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Commercial Mortgage Loans, Non Owner Occupied | Nonresidential real estate | ||
| Assets | ||
| Impaired loans | 6,763 | 5,483 |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Home Equity Line of Credit | Residential real estate | ||
| Assets | ||
| Impaired loans | 0 | 0 |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Multi Family | Residential real estate | ||
| Assets | ||
| Impaired loans | 1,543 | 0 |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Residential Real Estate Other Financing Receivable | Residential real estate | ||
| Assets | ||
| Impaired loans | $ 490 | $ 1,500 |