Loans Receivable and Allowance for Loan Losses (TDR Mortgage Loans, Subsequent Payment Default) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Mortgage loans (gross) loan	Sep. 30, 2013 Mortgage loans (gross) loan	Sep. 30, 2014 Mortgage loans (gross) loan	Sep. 30, 2013 Mortgage loans (gross) loan	Sep. 30, 2014 Mortgage loans (gross) Residential Mortgage Loans Full documentation interest-only loan	Sep. 30, 2013 Mortgage loans (gross) Residential Mortgage Loans Full documentation interest-only loan	Sep. 30, 2014 Mortgage loans (gross) Residential Mortgage Loans Full documentation interest-only loan	Sep. 30, 2013 Mortgage loans (gross) Residential Mortgage Loans Full documentation interest-only loan	Sep. 30, 2014 Mortgage loans (gross) Residential Mortgage Loans Full documentation amortizing loans loan	Sep. 30, 2013 Mortgage loans (gross) Residential Mortgage Loans Full documentation amortizing loans loan	Sep. 30, 2014 Mortgage loans (gross) Residential Mortgage Loans Full documentation amortizing loans loan	Sep. 30, 2013 Mortgage loans (gross) Residential Mortgage Loans Full documentation amortizing loans loan	Sep. 30, 2014 Mortgage loans (gross) Residential Mortgage Loans Reduced documentation interest-only loan	Sep. 30, 2013 Mortgage loans (gross) Residential Mortgage Loans Reduced documentation interest-only loan	Sep. 30, 2014 Mortgage loans (gross) Residential Mortgage Loans Reduced documentation interest-only loan	Sep. 30, 2013 Mortgage loans (gross) Residential Mortgage Loans Reduced documentation interest-only loan	Sep. 30, 2013 Mortgage loans (gross) Residential Mortgage Loans Reduced documentation amortizing loan	Sep. 30, 2014 Mortgage loans (gross) Residential Mortgage Loans Reduced documentation amortizing loan	Sep. 30, 2013 Mortgage loans (gross) Residential Mortgage Loans Reduced documentation amortizing loan	Sep. 30, 2013 Mortgage loans (gross) Multi-family loan	Sep. 30, 2013 Mortgage loans (gross) Multi-family loan
Information about loans receivable by segment and class modified in troubled debt restructuring
Loans receivable	$ 11,915,935	$ 12,442,066
Number of Loans			7	45	12	62	2	14	3	22	3	8	4	10	2	20	4	24	2	1	5	1	1
Recorded Investment			$ 2,476	$ 12,227	$ 3,802	$ 16,190	$ 714	$ 3,365	$ 854	$ 5,343	$ 852	$ 2,159	$ 1,057	$ 2,589	$ 910	$ 5,729	$ 1,799	$ 6,707	$ 303	$ 92	$ 880	$ 671	$ 671