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NON COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 7) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Covered loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total general reserve for allowance for loan losses allocated to covered loans | 3.10% |  |  |  |  |  | 1.80% |  |  |  |  | 3.10% |  | 1.80% |  |
Allowance on covered loans | $ (6,647) |  |  |  |  |  | $ (4,225) |  |  |  |  | $ (6,647) |  | $ (4,225) |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 234,633 |  |  |  |  |  | 238,833 | 234,633 |  | 238,833 |  |
Provision for loan losses | 20,000 |  | 22,000 | 26,500 | 26,506 |  | 29,834 |  | 38,648 | 55,256 | 76,421 | 95,006 |  | 200,159 |  | 528,666
Allowance for unfunded loan commitments and letters of credit |  |  |  |  |  |  |  |  |  |  |  | (1,048) |  | (1,833) |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  | (124,691) |  | (225,203) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  | 12,623 |  | 22,677 |  |
Net charge-offs |  |  |  |  |  |  |  |  |  |  |  | (112,068) |  | (202,526) |  |
Ending balance | 216,523 |  |  |  |  |  | 234,633 |  |  |  |  | 216,523 |  | 234,633 |  | 238,833
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 13,041 |  |  |  |  |  | 10,024 |  |  |  |  | 13,041 |  | 10,024 |  |
Loans collectively evaluated for impairment | 203,482 |  |  |  |  |  | 224,609 |  |  |  |  | 203,482 |  | 224,609 |  |
Ending balance | 216,523 |  |  |  |  |  | 234,633 |  |  |  |  | 216,523 |  | 234,633 |  | 238,833
Residential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 49,491 |  |  |  |  |  | 38,025 | 49,491 |  | 38,025 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  | 15,416 |  | 59,525 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  | (13,323) |  | (49,685) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  | 596 |  | 1,626 |  |
Net charge-offs |  |  |  |  |  |  |  |  |  |  |  | (12,727) |  | (48,059) |  |
Ending balance | 52,180 |  |  |  |  |  | 49,491 |  |  |  |  | 52,180 |  | 49,491 |  |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 2,255 |  |  |  |  |  | 309 |  |  |  |  | 2,255 |  | 309 |  |
Loans collectively evaluated for impairment | 49,925 |  |  |  |  |  | 49,182 |  |  |  |  | 49,925 |  | 49,182 |  |
Ending balance | 52,180 |  |  |  |  |  | 49,491 |  |  |  |  | 52,180 |  | 49,491 |  |
Commercial Real Estate ("CRE") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 117,752 |  |  |  |  |  | 147,591 | 117,752 |  | 147,591 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  | 22,817 |  | 97,548 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  | (78,803) |  | (137,460) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  | 4,691 |  | 10,073 |  |
Net charge-offs |  |  |  |  |  |  |  |  |  |  |  | (74,112) |  | (127,387) |  |
Ending balance | 66,457 |  |  |  |  |  | 117,752 |  |  |  |  | 66,457 |  | 117,752 |  |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 5,951 |  |  |  |  |  | 7,247 |  |  |  |  | 5,951 |  | 7,247 |  |
Loans collectively evaluated for impairment | 60,506 |  |  |  |  |  | 110,505 |  |  |  |  | 60,506 |  | 110,505 |  |
Ending balance | 66,457 |  |  |  |  |  | 117,752 |  |  |  |  | 66,457 |  | 117,752 |  |
Commercial and Industrial ("C&I") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 59,737 |  |  |  |  |  | 50,487 | 59,737 |  | 50,487 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  | 50,848 |  | 34,613 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  | (30,606) |  | (35,479) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  | 7,041 |  | 10,116 |  |
Net charge-offs |  |  |  |  |  |  |  |  |  |  |  | (23,565) |  | (25,363) |  |
Ending balance | 87,020 |  |  |  |  |  | 59,737 |  |  |  |  | 87,020 |  | 59,737 |  |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 4,835 |  |  |  |  |  | 2,468 |  |  |  |  | 4,835 |  | 2,468 |  |
Loans collectively evaluated for impairment | 82,185 |  |  |  |  |  | 57,269 |  |  |  |  | 82,185 |  | 57,269 |  |
Ending balance | 87,020 |  |  |  |  |  | 59,737 |  |  |  |  | 87,020 |  | 59,737 |  |
Consumer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 3,428 |  |  |  |  |  | 2,730 | 3,428 |  | 2,730 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  | 2,455 |  | 2,415 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  | (1,959) |  | (2,579) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  | 295 |  | 862 |  |
Net charge-offs |  |  |  |  |  |  |  |  |  |  |  | (1,664) |  | (1,717) |  |
Ending balance | 4,219 |  |  |  |  |  | 3,428 |  |  |  |  | 4,219 |  | 3,428 |  |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans collectively evaluated for impairment | 4,219 |  |  |  |  |  | 3,428 |  |  |  |  | 4,219 |  | 3,428 |  |
Ending balance | 4,219 |  |  |  |  |  | 3,428 |  |  |  |  | 4,219 |  | 3,428 |  |
Covered Loans Subject to Allowance For Loan Losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 4,225 | [1] |  |  |  |  |  | 4,225 | [1] |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  | 2,422 | [1] | 4,225 | [1] |
Ending balance | 6,647 | [1] |  |  |  |  | 4,225 | [1] |  |  |  | 6,647 | [1] | 4,225 | [1] |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans collectively evaluated for impairment | 6,647 | [1] |  |  |  |  | 4,225 | [1] |  |  |  | 6,647 | [1] | 4,225 | [1] |
Ending balance | 6,647 | [1] |  |  |  |  | 4,225 | [1] |  |  |  | 6,647 | [1] | 4,225 | [1] |
Unallocated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  | 1,048 |  | 1,833 |  |
Allowance for unfunded loan commitments and letters of credit |  |  |  |  |  |  |  |  |  |  |  | $ (1,048) |  | $ (1,833) |  |
[1] | This allowance is related to drawdowns on commitments that were in existence as of the acquisition dates of WFIB and UCB and, therefore, are covered under the shared-loss agreements with the FDIC. Allowance on these subsequent drawdowns is accounted for as part of the allowance for loan losses.

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- Definition The allowance for loan losses represents the reserve to cover probable credit losses related to specifically identified loans (loans covered by shared loss agreements), as of the balance sheet date. + References No definition available. + Details
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- Definition Reflects the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 03 -Paragraph 7 -Subparagraph d Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 + Details
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- Definition The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph a(ii) -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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 03 -Paragraph 7 -Subparagraph d Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 8, 9 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition The sum of the periodic provision charged to operations, based on an assessment of the uncollectibility of the loan and lease portfolio, the offset to which is either added to or deducted from the allowance account for the purpose of reducing loan receivable and leases to an amount that approximates their net realizable value (the amount expected to be collected). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 04 -Paragraph 11 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 5 -Paragraph 168, 169, 170 -IssueDate 2006-05-01 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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