COMMITMENTS AND CONTINGENCIES (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011 days	Dec. 31, 2010
Guarantor Obligations [Line Items]
Loans That Would Require Repurchase In Event Of Non Performance	$ 82,167	$ 122,718
Commitments to Extend Credit [Member]
Guarantor Obligations [Line Items]
Unused commitments	5,636,942	5,364,451
Standby Letters of Credit [Member]
Guarantor Obligations [Line Items]
Guarantor obligations amount	57,446	70,755
Recourse Obligation on Mortgage Loans Sold [Member]
Guarantor Obligations [Line Items]
Guarantor obligations amount	$ 207,963	$ 236,146
Recourse period, maximum (in days)	120

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and 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 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant