Borrowings (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Borrowings
Total borrowings, net	$ 4,109,028	$ 4,373,496
Weighted Average Rate (as a percent)	2.46%	3.03%
Federal funds purchased
Borrowings
Total borrowings, net	285,000
Weighted Average Rate (as a percent)	0.27%
Reverse repurchase agreements
Borrowings
Total borrowings, net	1,100,000	1,100,000
Weighted Average Rate (as a percent)	3.87%	4.32%
FHLB-NY advances | FHLB-NY
Borrowings
Total borrowings, net	2,476,000	2,897,000
Weighted Average Rate (as a percent)	1.83%	2.07%
Other borrowings, net
Borrowings
Total borrowings, net	$ 248,028	$ 376,496
Weighted Average Rate (as a percent)	5.00%	6.62%