Loans Receivable and Allowance for Loan Losses (TDR Mortgage Loans, Subsequent Payment Default) (Details) (Mortgage loans (gross), USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 loan	Mar. 31, 2014 loan
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	8	28
Recorded Investment	$ 4,203	$ 8,934
Residential Mortgage Loans | Full documentation interest-only
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	1	6
Recorded Investment	648	1,138
Residential Mortgage Loans | Full documentation amortizing loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	2	5
Recorded Investment	854	1,308
Residential Mortgage Loans | Reduced documentation interest-only
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	2	11
Recorded Investment	1,314	3,058
Residential Mortgage Loans | Reduced documentation amortizing
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans		3
Recorded Investment		846
Multi-family
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	3	2
Recorded Investment	1,387	1,015
Commercial real estate
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans		1
Recorded Investment		$ 1,569