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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Impairment Methodology) (Details) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010
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Recorded investment in total loans receivable related to each balance in the allowance for loan losses [Abstract] |  |  |  |
Loans individually evaluated for impairment | $ 207,962 |  | $ 281,006 |
Loans collectively evaluated for impairment | 10,185,892 |  | 8,998,107 |
Loans acquired with deteriorated credit quality | 4,431,663 | [1] | 5,394,048 | [1]
Ending balance | 14,825,517 |  | 14,673,161 |
Residential [Member] |  |  |  |
Recorded investment in total loans receivable related to each balance in the allowance for loan losses [Abstract] |  |  |  |
Loans individually evaluated for impairment | 44,726 |  | 51,519 |
Loans collectively evaluated for impairment | 2,415,656 |  | 2,068,974 |
Loans acquired with deteriorated credit quality | 1,401,215 | [1] | 1,614,732 | [1]
Ending balance | 3,861,597 |  | 3,708,501 |
Commercial Real Estate [Member] |  |  |  |
Recorded investment in total loans receivable related to each balance in the allowance for loan losses [Abstract] |  |  |  |
Loans individually evaluated for impairment | 134,799 |  | 201,926 |
Loans collectively evaluated for impairment | 3,696,342 |  | 3,704,812 |
Loans acquired with deteriorated credit quality | 2,487,186 | [1] | 3,059,133 | [1]
Ending balance | 6,318,327 |  | 6,965,871 |
Commercial and Industrial [Member] |  |  |  |
Recorded investment in total loans receivable related to each balance in the allowance for loan losses [Abstract] |  |  |  |
Loans individually evaluated for impairment | 25,585 |  | 26,941 |
Loans collectively evaluated for impairment | 2,986,567 |  | 1,956,415 |
Loans acquired with deteriorated credit quality | 471,994 | [1] | 634,560 | [1]
Ending balance | 3,484,146 |  | 2,617,916 |
Consumer [Member] |  |  |  |
Recorded investment in total loans receivable related to each balance in the allowance for loan losses [Abstract] |  |  |  |
Loans individually evaluated for impairment | 2,852 |  | 620 |
Loans collectively evaluated for impairment | 500,723 |  | 732,905 |
Loans acquired with deteriorated credit quality | 71,268 | [1] | 85,623 | [1]
Ending balance | 574,843 |  | 819,148 |
Covered Loans Subject to Allowance For Loan Losses [Member] |  |  |  |
Recorded investment in total loans receivable related to each balance in the allowance for loan losses [Abstract] |  |  |  |
Loans individually evaluated for impairment | 0 |  | 0 |
Loans collectively evaluated for impairment | 586,604 |  | 561,725 |
Loans acquired with deteriorated credit quality | 0 | [1] | 0 | [1]
Ending balance | $ 586,604 |  | $ 561,725 |
[1] | The Company has elected to account for all covered loans acquired in the FDIC-assisted acquisitions under ASC 310-30. The total principal balance is presented and excludes the purchase discount and any additional advances subsequent to acquisition date.

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- Definition The balance of financing receivables that were acquired with deteriorated credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (h) + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (h) + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (h) + Details
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- Definition Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -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 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 + Details
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