Borrowings (Details 7) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Borrowings
Interest expense on borrowings	$ 154,219	$ 181,773	$ 230,717
Reverse repurchase agreements
Borrowings
Interest expense on borrowings	61,855	82,602	95,538
FHLB-NY advances
Borrowings
Interest expense on borrowings	62,675	71,909	107,917
Other borrowings
Borrowings
Interest expense on borrowings	$ 29,689	$ 27,262	$ 27,262

Aggregate amount of interest expense on all borrowings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.7,8)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Name:	us-gaap_InterestExpenseBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration