Loans Receivable and Allowance for Loan Losses (Details 9) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired
Unpaid Principal Balance	$ 518,478	$ 457,440
Recorded Investment	406,232	346,906
Related Allowance	(25,941)	(5,046)
Net Investment	380,291	341,860
Residential | Full documentation interest-only loans
Financing Receivable, Impaired
Unpaid Principal Balance, Loans with an allowance recorded	134,138	10,740
Unpaid Principal Balance, Loans without an allowance recorded	28,717	122,275
Recorded Investment, Loans with an allowance recorded	105,291	10,740
Recorded Investment, Loans without an allowance recorded	20,088	86,607
Related Allowance	(8,196)	(241)
Net Investment, Loans with an allowance recorded	97,095	10,499
Net Investment, Loans without an allowance recorded	20,088	86,607
Residential | Full documentation amortizing loans
Financing Receivable, Impaired
Unpaid Principal Balance, Loans with an allowance recorded	31,131	6,122
Unpaid Principal Balance, Loans without an allowance recorded	8,825	23,489
Recorded Investment, Loans with an allowance recorded	27,390	6,122
Recorded Investment, Loans without an allowance recorded	6,370	17,962
Related Allowance	(2,205)	(347)
Net Investment, Loans with an allowance recorded	25,185	5,775
Net Investment, Loans without an allowance recorded	6,370	17,962
Residential | Reduced documentation interest-only loans
Financing Receivable, Impaired
Unpaid Principal Balance, Loans with an allowance recorded	201,169	12,893
Unpaid Principal Balance, Loans without an allowance recorded		166,477
Recorded Investment, Loans with an allowance recorded	151,621	12,893
Recorded Investment, Loans without an allowance recorded		116,514
Related Allowance	(10,270)	(277)
Net Investment, Loans with an allowance recorded	141,351	12,616
Net Investment, Loans without an allowance recorded		116,514
Residential | Reduced documentation amortizing loans
Financing Receivable, Impaired
Unpaid Principal Balance, Loans with an allowance recorded	31,670	3,889
Unpaid Principal Balance, Loans without an allowance recorded		23,419
Recorded Investment, Loans with an allowance recorded	25,667	3,889
Recorded Investment, Loans without an allowance recorded		17,419
Related Allowance	(3,813)	(136)
Net Investment, Loans with an allowance recorded	21,854	3,753
Net Investment, Loans without an allowance recorded		17,419
Multi-Family
Financing Receivable, Impaired
Unpaid Principal Balance, Loans with an allowance recorded	17,083	19,704
Unpaid Principal Balance, Loans without an allowance recorded	40,467	44,341
Recorded Investment, Loans with an allowance recorded	17,083	19,704
Recorded Investment, Loans without an allowance recorded	33,834	36,412
Related Allowance	(1,157)	(2,576)
Net Investment, Loans with an allowance recorded	15,926	17,128
Net Investment, Loans without an allowance recorded	33,834	36,412
Commercial Real Estate
Financing Receivable, Impaired
Unpaid Principal Balance, Loans with an allowance recorded	8,727	10,835
Unpaid Principal Balance, Loans without an allowance recorded	16,551	13,256
Recorded Investment, Loans with an allowance recorded	8,727	10,835
Recorded Investment, Loans without an allowance recorded	10,161	7,809
Related Allowance	(300)	(1,469)
Net Investment, Loans with an allowance recorded	8,427	9,366
Net Investment, Loans without an allowance recorded	$ 10,161	$ 7,809