Loans Receivable and Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loans receivable and allowance for loan losses
Balance at the beginning of the period	$ 157,185	$ 201,499	$ 194,049
Provision charged to operations	40,400	37,000	115,000
Charge-offs	(61,217)	(92,797)	(123,248)
Recoveries	9,133	11,483	15,698
Balance at the end of the period	145,501	157,185	201,499
Consumer and Other Loans
Loans receivable and allowance for loan losses
Balance at the beginning of the period	3,800	4,146	6,978
Provision charged to operations	4,538	1,182	(398)
Charge-offs	(2,541)	(1,665)	(2,583)
Recoveries	519	137	149
Balance at the end of the period	6,316	3,800	4,146
Mortgage Loans (Gross) | Residential
Loans receivable and allowance for loan losses
Balance at the beginning of the period	105,991	125,524	113,288
Provision charged to operations	24,663	34,457	83,816
Charge-offs	(49,794)	(64,834)	(84,537)
Recoveries	8,407	10,844	12,957
Balance at the end of the period	89,267	105,991	125,524
Mortgage Loans (Gross) | Multi-Family
Loans receivable and allowance for loan losses
Balance at the beginning of the period	35,422	56,266	63,145
Provision charged to operations	6,161	814	20,412
Charge-offs	(6,275)	(22,160)	(29,158)
Recoveries	206	502	1,867
Balance at the end of the period	35,514	35,422	56,266
Mortgage Loans (Gross) | Commercial Real Estate
Loans receivable and allowance for loan losses
Balance at the beginning of the period	11,972	15,563	10,638
Provision charged to operations	5,038	547	11,170
Charge-offs	(2,607)	(4,138)	(6,970)
Recoveries	1		725
Balance at the end of the period	$ 14,404	$ 11,972	$ 15,563