Borrowings (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Borrowings
Reverse repurchase agreements	$ 1,100,000	$ 1,700,000
FHLB-NY advances	2,897,000	2,043,000
Other borrowings, net	376,496	378,573
Total borrowings, net	4,373,496	4,121,573
Weighted Average Rate (as a percent)	3.03%	3.98%
Reverse repurchase agreements
Borrowings
Reverse repurchase agreements	1,100,000	1,700,000	2,100,000
Weighted Average Rate (as a percent)	4.32%	4.30%	4.19%
FHLB Advances | FHLB-NY
Borrowings
FHLB-NY advances	$ 2,897,000	$ 2,043,000	$ 2,391,000
Weighted Average Rate (as a percent)	2.07%	3.13%	3.62%
Other borrowings
Borrowings
Weighted Average Rate (as a percent)	6.62%	7.11%