Loans Receivable and Allowance for Loan Losses (Details 11) (Mortgage Loans (Gross), USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011 item
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	14	21
Recorded Investment	$ 7,854	$ 8,042
Residential Mortgage Loans | Full Documentation Interest-only Loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	1	5
Recorded Investment	165	1,797
Residential Mortgage Loans | Full Documentation Amortizing Loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	2	1
Recorded Investment	643	83
Residential Mortgage Loans | Reduced Documentation Interest-only Loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	5	12
Recorded Investment	1,829	5,482
Residential Mortgage Loans | Reduced Documentation Amortizing Loans
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	4	2
Recorded Investment	1,628	358
Multi-Family
Information about loans receivable by segment and class modified in troubled debt restructuring
Number of Loans	2	1
Recorded Investment	$ 3,589	$ 322