Fair Value (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	$ 1,086,629	$ 1,110,776
Mortgage backed securities	630,065	654,249
Total other assets	157	90
Total other liabilities	5,387	5,743
Trust preferred securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	38,241	38,027
Municipal securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	189,259	190,887
Equity securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	1,991	1,818
Corporate bonds [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	227,073	225,795
U.S. sponsored entities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Mortgage backed securities	627,756	649,933
Private label [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Mortgage backed securities	2,309	4,316
Interest rate caps [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Total other assets	157	90
Interest rate swaps [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Total other liabilities	5,387	5,743
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	1,991	1,818
Mortgage backed securities
Total other assets
Total other liabilities
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Trust preferred securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Municipal securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Equity securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	1,991	1,818
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Corporate bonds [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | U.S. sponsored entities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Mortgage backed securities
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Private label [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Mortgage backed securities
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Interest rate caps [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Total other assets
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level I) [Member] | Interest rate swaps [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Total other liabilities
Significant Other Observable Inputs (Level II) [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	1,048,285	1,072,779
Mortgage backed securities	630,065	654,249
Total other assets	157	90
Total other liabilities	5,387	5,743
Significant Other Observable Inputs (Level II) [Member] | Trust preferred securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	1,888	1,848
Significant Other Observable Inputs (Level II) [Member] | Municipal securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	189,259	190,887
Significant Other Observable Inputs (Level II) [Member] | Equity securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale
Significant Other Observable Inputs (Level II) [Member] | Corporate bonds [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	227,073	225,795
Significant Other Observable Inputs (Level II) [Member] | U.S. sponsored entities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Mortgage backed securities	627,756	649,933
Significant Other Observable Inputs (Level II) [Member] | Private label [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Mortgage backed securities	2,309	4,316
Significant Other Observable Inputs (Level II) [Member] | Interest rate caps [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Total other assets	157	90
Significant Other Observable Inputs (Level II) [Member] | Interest rate swaps [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Total other liabilities	5,387	5,743
Significant Unobservable Inputs (Level III) [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	36,353	36,179
Mortgage backed securities
Total other assets
Total other liabilities
Significant Unobservable Inputs (Level III) [Member] | Trust preferred securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale	36,353	36,179
Significant Unobservable Inputs (Level III) [Member] | Municipal securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale
Significant Unobservable Inputs (Level III) [Member] | Equity securities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale
Significant Unobservable Inputs (Level III) [Member] | Corporate bonds [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Securities available for sale
Significant Unobservable Inputs (Level III) [Member] | U.S. sponsored entities [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Mortgage backed securities
Significant Unobservable Inputs (Level III) [Member] | Private label [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Mortgage backed securities
Significant Unobservable Inputs (Level III) [Member] | Interest rate caps [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Total other assets
Significant Unobservable Inputs (Level III) [Member] | Interest rate swaps [Member]
Assets and liabilities reported on the consolidated statements of financial condition on a recurring basis
Total other liabilities