Fair Value - Assets and Liabilities Reported on Consolidated Statements of Financial Condition at Fair Value on a Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 1,093,354	$ 1,063,016
Mortgage backed securities	686,117	636,229
Total other assets	462	717
U.S. Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	684,545	634,424
Mortgage backed securities	684,545	634,424
Private Label [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,572	1,805
Mortgage backed securities	1,572	1,805
Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	38,854	38,906
Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	180,312	179,740
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,453	1,921
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	186,618	206,220
Interest Rate Caps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other assets	462	717
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	1,453	1,921
Mortgage backed securities
Total other assets
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
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
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Trust Preferred Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale
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	1,453	1,921
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale
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
Significant Other Observable Inputs (Level II) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,054,846	1,023,886
Mortgage backed securities	686,117	636,229
Total other assets	462	717
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	684,545	634,424
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	1,572	1,805
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	1,799	1,697
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	180,312	179,740
Significant Other Observable Inputs (Level II) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale
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	186,618	206,220
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	462	717
Significant Unobservable Inputs (Level III) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	37,055	37,209
Mortgage backed securities
Total other assets
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
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
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	37,055	37,209
Significant Unobservable Inputs (Level III) [Member] | Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale
Significant Unobservable Inputs (Level III) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale
Significant Unobservable Inputs (Level III) [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale
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
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other liabilities	3,618	3,870
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	3,618	3,870
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]
Total other liabilities
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] | Significant Other Observable Inputs (Level II) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other liabilities	3,618	3,870
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	3,618	3,870
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level III) [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 Swaps [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other liabilities