Loans Receivable and Allowance for Loan Losses (Details 12) (Mortgage Loans (Gross), USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 item	Jun. 30, 2012 item	Jun. 30, 2013 item	Jun. 30, 2012 item
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	42	12	56	17
Recorded Investment	$ 12,435	$ 7,136	$ 16,264	$ 8,928
Residential Mortgage Loans | Full documentation interest-only loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	11	1	18	1
Recorded Investment	2,915	339	4,554	339
Residential Mortgage Loans | Full documentation amortizing loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	9	1	9	1
Recorded Investment	2,668	79	2,668	79
Residential Mortgage Loans | Reduced documentation interest-only loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	19	5	24	6
Recorded Investment	6,369	1,701	8,157	2,057
Residential Mortgage Loans | Reduced documentation amortizing loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	3	2	5	6
Recorded Investment	483	544	885	1,980
Multi-Family
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans		3		3
Recorded Investment		$ 4,473		$ 4,473