Borrowings (Details 5) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
FHLB-NY advances
Total	$ 2,897,000,000	$ 2,043,000,000
FHLB Advances | FHLB-NY
FHLB-NY advances
2013	1,047,000,000
2014	150,000,000
2015	300,000,000
2016	750,000,000
2017	650,000,000
Total	2,897,000,000	2,043,000,000	2,391,000,000
Due overnight	22,000,000
Due in less than 30 days	650,000,000
Due in 30-60 days	50,000,000
Due after 90 days	325,000,000
Callable	$ 200,000,000