Loans and Allowance for Loan Losses (Details 3) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Troubled debt restructuring by class
Number of Contracts	86	9
Pre- restructuring Outstanding Recorded Investment	$ 42,864,000	$ 11,018,000
Post- restructuring Outstanding Recorded Investment	41,794,000	11,045,000
Recorded Investment	41,800,000	11,100,000
One- to four-family, Amortizing [Member]
Troubled debt restructuring by class
Number of Contracts	79	6
Pre- restructuring Outstanding Recorded Investment	31,876,000	2,014,000
Post- restructuring Outstanding Recorded Investment	30,797,000	2,031,000
One- to four-family, Interest-only [Member]
Troubled debt restructuring by class
Number of Contracts	5	1
Pre- restructuring Outstanding Recorded Investment	3,077,000	1,093,000
Post- restructuring Outstanding Recorded Investment	3,086,000	1,103,000
Multi-family and commercial mortgages [Member]
Troubled debt restructuring by class
Number of Contracts	2	2
Pre- restructuring Outstanding Recorded Investment	7,911,000	7,911,000
Post- restructuring Outstanding Recorded Investment	$ 7,911,000	$ 7,911,000