Loans Receivable and Allowance for Loan Losses (Details 11) (Mortgage Loans (Gross), USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 item	Mar. 31, 2012 item
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	26	14
Pre-Modification Recorded Investment	$ 10,783	$ 29,499
Recorded Investment	10,147	28,561
Residential Mortgage Loans | Full documentation interest-only loans
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	6
Pre-Modification Recorded Investment	1,504
Recorded Investment	1,461
Residential Mortgage Loans | Full documentation amortizing loans
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	2
Pre-Modification Recorded Investment	781
Recorded Investment	781
Residential Mortgage Loans | Reduced documentation interest-only loans
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	11	3
Pre-Modification Recorded Investment	3,433	914
Recorded Investment	3,349	914
Residential Mortgage Loans | Reduced documentation amortizing loans
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	3	4
Pre-Modification Recorded Investment	742	1,549
Recorded Investment	730	1,473
Multi-Family
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	3	6
Pre-Modification Recorded Investment	2,784	26,037
Recorded Investment	2,476	25,233
Commercial Real Estate
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	1	1
Pre-Modification Recorded Investment	1,539	999
Recorded Investment	$ 1,350	$ 941