Loans Receivable and Allowance for Loan Losses (Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing receivable, impaired
Unpaid Principal Balance	$ 293,051	$ 483,132
Recorded Investment	250,749	384,522
Related Allowance	(19,885)	(21,531)
Net Investment	230,864	362,991
Consumer and other loans | Home equity lines of credit
Financing receivable, impaired
Unpaid Principal Balance, Loans with an allowance recorded	6,051
Recorded Investment, Loans with an allowance recorded	5,768
Related Allowance	(4,340)
Net Investment, Loans with an allowance recorded	1,428
Mortgage loans | Residential | Full documentation interest-only
Financing receivable, impaired
Unpaid Principal Balance, Loans with an allowance recorded	62,496	142,659
Recorded Investment, Loans with an allowance recorded	53,319	109,877
Related Allowance	(3,052)	(6,019)
Net Investment, Loans with an allowance recorded	50,267	103,858
Mortgage loans | Residential | Full documentation amortizing loans
Financing receivable, impaired
Unpaid Principal Balance, Loans with an allowance recorded	35,521	41,136
Recorded Investment, Loans with an allowance recorded	33,189	36,091
Related Allowance	(1,043)	(2,458)
Net Investment, Loans with an allowance recorded	32,146	33,633
Mortgage loans | Residential | Reduced documentation interest-only
Financing receivable, impaired
Unpaid Principal Balance, Loans with an allowance recorded	91,461	183,280
Recorded Investment, Loans with an allowance recorded	77,977	140,357
Related Allowance	(4,836)	(7,673)
Net Investment, Loans with an allowance recorded	73,141	132,684
Mortgage loans | Residential | Reduced documentation amortizing
Financing receivable, impaired
Unpaid Principal Balance, Loans with an allowance recorded	18,298	30,660
Recorded Investment, Loans with an allowance recorded	17,001	25,605
Related Allowance	(858)	(2,202)
Net Investment, Loans with an allowance recorded	16,143	23,403
Mortgage loans | Multi-family
Financing receivable, impaired
Unpaid Principal Balance, Loans with an allowance recorded	36,424	19,748
Unpaid Principal Balance, Loans without an allowance recorded	16,670	39,871
Recorded Investment, Loans with an allowance recorded	29,043	19,748
Recorded Investment, Loans without an allowance recorded	15,269	32,790
Related Allowance	(3,448)	(2,877)
Net Investment, Loans with an allowance recorded	25,595	16,871
Net Investment, Loans without an allowance recorded	15,269	32,790
Mortgage loans | Commercial real estate
Financing receivable, impaired
Unpaid Principal Balance, Loans with an allowance recorded	26,130	5,790
Unpaid Principal Balance, Loans without an allowance recorded		19,988
Recorded Investment, Loans with an allowance recorded	19,183	5,790
Recorded Investment, Loans without an allowance recorded		14,264
Related Allowance	(2,308)	(302)
Net Investment, Loans with an allowance recorded	16,875	5,488
Net Investment, Loans without an allowance recorded		$ 14,264