Fair Value - Assets and Liabilities Reported on Consolidated Statements of Financial Condition at Fair Value on a Recurring Basis (Detail) (USD $) | Mar. 31, 2014 | Dec. 31, 2013 |
In Thousands, unless otherwise specified |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | $1,082,243 | $1,063,016 |
U.S. Sponsored Entities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 656,345 | 634,424 |
Private Label [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 1,695 | 1,805 |
Trust Preferred Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 38,915 | 38,906 |
Municipal Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 182,516 | 179,740 |
Equity Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 1,492 | 1,921 |
Corporate Bonds [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 201,280 | 206,220 |
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 1,492 | 1,921 |
Significant Other Observable Inputs (Level II) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 1,043,605 | 1,023,886 |
Significant Unobservable Inputs (Level III) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 37,146 | 37,209 |
Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 1,082,243 | 1,063,016 |
Mortgage backed securities | 658,040 | 636,229 |
Total other assets | 754 | 717 |
Total other liabilities | 3,663 | 3,870 |
Fair Value, Measurements, Recurring [Member] | U.S. Sponsored Entities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Mortgage backed securities | 656,345 | 634,424 |
Fair Value, Measurements, Recurring [Member] | Private Label [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Mortgage backed securities | 1,695 | 1,805 |
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 38,915 | 38,906 |
Fair Value, Measurements, Recurring [Member] | Municipal Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 182,516 | 179,740 |
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 1,492 | 1,921 |
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 201,280 | 206,220 |
Fair Value, Measurements, Recurring [Member] | Interest Rate Swaps [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total other liabilities | 3,663 | 3,870 |
Fair Value, Measurements, Recurring [Member] | Interest Rate Caps [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total other assets | 754 | 717 |
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 1,492 | 1,921 |
Mortgage backed securities | ' | ' |
Total other assets | ' | ' |
Total other liabilities | ' | ' |
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | U.S. Sponsored Entities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Mortgage backed securities | ' | ' |
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Private Label [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Mortgage backed securities | ' | ' |
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Equity Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 1,492 | 1,921 |
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Interest Rate Swaps [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total other liabilities | ' | ' |
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Interest Rate Caps [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total other assets | ' | ' |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level II) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 1,043,605 | 1,023,886 |
Mortgage backed securities | 658,040 | 636,229 |
Total other assets | 754 | 717 |
Total other liabilities | 3,663 | 3,870 |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level II) [Member] | U.S. Sponsored Entities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Mortgage backed securities | 656,345 | 634,424 |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level II) [Member] | Private Label [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Mortgage backed securities | 1,695 | 1,805 |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level II) [Member] | Trust Preferred Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 1,769 | 1,697 |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level II) [Member] | Municipal Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 182,516 | 179,740 |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level II) [Member] | Corporate Bonds [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 201,280 | 206,220 |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level II) [Member] | Interest Rate Swaps [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total other liabilities | 3,663 | 3,870 |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level II) [Member] | Interest Rate Caps [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total other assets | 754 | 717 |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level III) [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 37,146 | 37,209 |
Mortgage backed securities | ' | ' |
Total other assets | ' | ' |
Total other liabilities | ' | ' |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level III) [Member] | U.S. Sponsored Entities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Mortgage backed securities | ' | ' |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level III) [Member] | Private Label [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Mortgage backed securities | ' | ' |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level III) [Member] | Trust Preferred Securities [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Securities available for sale | 37,146 | 37,209 |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level III) [Member] | Interest Rate Swaps [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total other liabilities | ' | ' |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level III) [Member] | Interest Rate Caps [Member] | ' | ' |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ' | ' |
Total other assets | ' | ' |