Loans Receivable and Allowance for Loan Losses (Details 12) (Mortgage Loans (Gross), USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 item	Mar. 31, 2012 item
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	53	17
Recorded Investment	$ 16,781	$ 7,663
Residential Mortgage Loans | Full documentation interest-only loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	19	2
Recorded Investment	5,265	524
Residential Mortgage Loans | Full documentation amortizing loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	7	1
Recorded Investment	1,176	81
Residential Mortgage Loans | Reduced documentation interest-only loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	21	7
Recorded Investment	7,986	3,493
Residential Mortgage Loans | Reduced documentation amortizing loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	5	6
Recorded Investment	991	1,780
Multi-Family
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans		1
Recorded Investment		1,785
Commercial Real Estate
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	1
Recorded Investment	$ 1,363