Loans Receivable and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Loans receivable and allowance for loan losses
Balance at the beginning of the period	$ 143,900	$ 148,102	$ 145,501	$ 157,185
Provision charged (credited) to operations	2,541	9,500	16,193	29,500
Charge-offs	(6,496)	(11,698)	(27,954)	(44,822)
Recoveries	3,055	2,568	9,260	6,609
Balance at the end of the period	143,000	148,472	143,000	148,472
Mortgage Loans (Gross) | Residential
Loans receivable and allowance for loan losses
Balance at the beginning of the period	78,788	87,394	89,267	105,991
Provision charged (credited) to operations	7,659	9,210	7,488	16,387
Charge-offs	(5,560)	(8,195)	(20,332)	(37,598)
Recoveries	2,537	2,355	7,001	5,984
Balance at the end of the period	83,424	90,764	83,424	90,764
Mortgage Loans (Gross) | Multi-Family
Loans receivable and allowance for loan losses
Balance at the beginning of the period	40,865	48,142	35,514	35,422
Provision charged (credited) to operations	(2,521)	(6,168)	5,131	8,381
Charge-offs	(99)	(1,233)	(3,637)	(3,139)
Recoveries		122	1,237	199
Balance at the end of the period	38,245	40,863	38,245	40,863
Mortgage Loans (Gross) | Commercial Real Estate
Loans receivable and allowance for loan losses
Balance at the beginning of the period	16,642	9,109	14,404	11,972
Provision charged (credited) to operations	(2,592)	3,828	1,378	1,303
Charge-offs	(293)	(1,379)	(2,313)	(1,718)
Recoveries	247		535	1
Balance at the end of the period	14,004	11,558	14,004	11,558
Consumer and Other Loans
Loans receivable and allowance for loan losses
Balance at the beginning of the period	7,605	3,457	6,316	3,800
Provision charged (credited) to operations	(5)	2,630	2,196	3,429
Charge-offs	(544)	(891)	(1,672)	(2,367)
Recoveries	271	91	487	425
Balance at the end of the period	$ 7,327	$ 5,287	$ 7,327	$ 5,287