Borrowings (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Borrowings
Total borrowings, net	$ 4,021,895	$ 4,373,496
Weighted Average Rate (as a percent)	2.64%	3.03%
Federal funds purchased
Borrowings
Total borrowings, net	280,000
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)	4.08%	4.32%
FHLB-NY advances | FHLB-NY
Borrowings
Total borrowings, net	2,394,000	2,897,000
Weighted Average Rate (as a percent)	2.01%	2.07%
Other borrowings, net
Borrowings
Total borrowings, net	$ 247,895	$ 376,496
Weighted Average Rate (as a percent)	5.00%	6.62%