Fair Value Measurements (Details 4)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Valuation methodologies used for assets measured at fair value
Impaired loans comprising residential mortgage loans (as a percent)	81.00%	78.00%
Impaired loans comprising multi-family and commercial real estate loans (as a percent)	19.00%	22.00%
Impaired loans for which fair value adjustment is recognized comprising residential mortgage loans (as a percent)	83.00%	84.00%
Impaired loans for which fair value adjustment is recognized comprising multi-family and commercial real estate loans (as a percent)	17.00%	16.00%
Weighted average
Valuation methodologies used for assets measured at fair value
Assumption to estimate fair value of servicing asset, weighted average discount rate (as a percent)	9.45%	10.95%
Assumption to estimate fair value of servicing asset, weighted average constant prepayment rate (as a percent)	10.52%	23.12%
Assumption to estimate fair value of servicing asset, weighted average life	6 years 3 months 18 days	3 years 4 months 24 days
Residential Mortgage Loans
Valuation methodologies used for assets measured at fair value
Period past due when loan servicer performs property inspections	45 days
Period after which loans are individually evaluated for impairment	180 days