Loans Receivable and Allowance for Loan Losses (Details 11) (Mortgage Loans (Gross), USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 item	Sep. 30, 2012 item	Sep. 30, 2013 item	Sep. 30, 2012 item
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	29	13	75	44
Pre-Modification Recorded Investment	$ 16,238	$ 7,290	$ 34,862	$ 48,844
Recorded Investment	15,002	7,155	32,941	44,666
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	7	2	18	6
Pre-Modification Recorded Investment	2,128	355	4,579	1,415
Recorded Investment	2,127	354	4,577	1,384
Residential Mortgage Loans | Full documentation amortizing loans
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	1	3	6	3
Pre-Modification Recorded Investment	161	805	1,662	805
Recorded Investment	161	786	1,682	786
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	10	5	28	12
Pre-Modification Recorded Investment	3,107	2,693	8,957	5,422
Recorded Investment	3,096	2,690	8,921	5,407
Residential Mortgage Loans | Reduced documentation amortizing loans
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	2		8	5
Pre-Modification Recorded Investment	387		2,470	1,950
Recorded Investment	386		2,408	1,840
Multi-Family
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	5		8	12
Pre-Modification Recorded Investment	3,967		6,751	31,581
Recorded Investment	3,774		6,228	29,129
Commercial Real Estate
Information about mortgage loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	4	3	7	6
Pre-Modification Recorded Investment	6,488	3,437	10,443	7,671
Recorded Investment	$ 5,458	$ 3,325	$ 9,125	$ 6,120