Loans Receivable and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Loans receivable and allowance for loan losses
Balance at the beginning of the period	$ 144,250	$ 149,899	$ 145,501	$ 157,185
Provision charged (credited) to operations	4,526	10,000	13,652	20,000
Charge-offs	(8,104)	(14,049)	(21,458)	(33,124)
Recoveries	3,228	2,252	6,205	4,041
Balance at the end of the period	143,900	148,102	143,900	148,102
Consumer and Other Loans
Loans receivable and allowance for loan losses
Balance at the beginning of the period	6,357	3,672	6,316	3,800
Provision charged (credited) to operations	1,357	415	2,201	799
Charge-offs	(222)	(876)	(1,128)	(1,476)
Recoveries	113	246	216	334
Balance at the end of the period	7,605	3,457	7,605	3,457
Mortgage Loans (Gross) | Residential
Loans receivable and allowance for loan losses
Balance at the beginning of the period	91,546	90,898	89,267	105,991
Provision charged (credited) to operations	(9,077)	6,189	(171)	7,177
Charge-offs	(6,459)	(11,699)	(14,772)	(29,403)
Recoveries	2,778	2,006	4,464	3,629
Balance at the end of the period	78,788	87,394	78,788	87,394
Mortgage Loans (Gross) | Multi-Family
Loans receivable and allowance for loan losses
Balance at the beginning of the period	33,952	44,927	35,514	35,422
Provision charged (credited) to operations	7,461	4,689	7,652	14,549
Charge-offs	(597)	(1,474)	(3,538)	(1,906)
Recoveries	49		1,237	77
Balance at the end of the period	40,865	48,142	40,865	48,142
Mortgage Loans (Gross) | Commercial Real Estate
Loans receivable and allowance for loan losses
Balance at the beginning of the period	12,395	10,402	14,404	11,972
Provision charged (credited) to operations	4,785	(1,293)	3,970	(2,525)
Charge-offs	(826)		(2,020)	(339)
Recoveries	288		288	1
Balance at the end of the period	$ 16,642	$ 9,109	$ 16,642	$ 9,109