Loans Receivable and Allowance for Loan Losses (Details 12) (Geographic Concentration Risk, Residential)	12 Months Ended
	Dec. 31, 2012
New York
Percentage of total residential mortgage loans by state or region
Percentage of Total	28.70%
Illinois
Percentage of total residential mortgage loans by state or region
Percentage of Total	10.70%
Connecticut
Percentage of total residential mortgage loans by state or region
Percentage of Total	10.60%
Massachusetts
Percentage of total residential mortgage loans by state or region
Percentage of Total	8.20%
New Jersey
Percentage of total residential mortgage loans by state or region
Percentage of Total	7.40%
California
Percentage of total residential mortgage loans by state or region
Percentage of Total	6.00%
Virginia
Percentage of total residential mortgage loans by state or region
Percentage of Total	6.10%
Maryland
Percentage of total residential mortgage loans by state or region
Percentage of Total	5.80%
Florida
Percentage of total residential mortgage loans by state or region
Percentage of Total	1.80%
Non-performing | New York
Percentage of total residential mortgage loans by state or region
Percentage of Total	14.80%
Non-performing | Illinois
Percentage of total residential mortgage loans by state or region
Percentage of Total	14.00%
Non-performing | Connecticut
Percentage of total residential mortgage loans by state or region
Percentage of Total	10.40%
Non-performing | Massachusetts
Percentage of total residential mortgage loans by state or region
Percentage of Total	2.70%
Non-performing | New Jersey
Percentage of total residential mortgage loans by state or region
Percentage of Total	20.00%
Non-performing | California
Percentage of total residential mortgage loans by state or region
Percentage of Total	9.00%
Non-performing | Virginia
Percentage of total residential mortgage loans by state or region
Percentage of Total	4.00%
Non-performing | Maryland
Percentage of total residential mortgage loans by state or region
Percentage of Total	11.20%
Non-performing | Florida
Percentage of total residential mortgage loans by state or region
Percentage of Total	6.20%