Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Impaired Loans [Member]
Fair value measurements for financial instruments measured on a non-recurring basis
Fair Value	$ 83,163	$ 73,240
Impaired Loans [Member] | One to Four Family [Member]
Fair value measurements for financial instruments measured on a non-recurring basis
Fair Value	67,705
Valuation Technique	Net Present Value
Significant Unobservable Input	N/A
Minimum range used to measure financial instruments	0.00%
Maximum range used to measure financial instruments	25.00%
Weighted average range used to measure financial instrument	1.70%
Impaired Loans [Member] | Multi family, Commercial and Construction Mortgages [Member]
Fair value measurements for financial instruments measured on a non-recurring basis
Fair Value	15,458
Valuation Technique	Appraisal Value
Significant Unobservable Input	Adjustment for differences between the comparable sales
Fair Value Assets Measured on Nonrecurring Basis Weighted Average Range	N/A
Foreclosed Real Estate [Member]
Fair value measurements for financial instruments measured on a non-recurring basis
Fair Value	$ 34,770	$ 40,619
Valuation Technique	Appraisal Value
Significant Unobservable Input	Adjustment for differences between the comparable sales
Minimum range used to measure financial instruments	0.00%
Maximum range used to measure financial instruments	100.00%
Weighted average range used to measure financial instrument	15.70%