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NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 13) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | $ 234,535 |  |  |  |  |  | $ 216,523 |  | $ 234,535 |  | $ 216,523 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 22,364 |  | 65,184 |  | 95,006
Allowance for unfunded loan commitments and letters of credit |  |  |  |  |  |  |  |  |  |  |  |  | (2,157) |  | 1,563 |  |
Charge-offs | (6,286) |  | (4,535) | (8,277) | 762 |  | (13,773) |  | (13,321) | (16,595) | (16,479) |  | (17,780) |  | (64,912) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 12,713 |  | 16,177 |  |
Net (charge-offs)/recoveries |  |  |  |  |  |  |  |  |  |  |  |  | (5,067) |  | (48,735) |  |
Ending balance | 249,675 |  |  |  |  |  | 234,535 |  |  |  |  |  | 249,675 |  | 234,535 |  | 216,523
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 24,143 |  |  |  |  |  | 11,527 |  |  |  |  |  | 24,143 |  | 11,527 |  |
Loans collectively evaluated for impairment | 223,263 |  |  |  |  |  | 223,008 |  |  |  |  |  | 223,263 |  | 223,008 |  |
Covered loans acquired with deteriorated credit quality | 2,269 | [1] |  |  |  |  |  |  |  |  |  |  | 2,269 | [1] |  |  |
Ending balance | 249,675 |  |  |  |  |  | 234,535 |  |  |  |  |  | 249,675 |  | 234,535 |  | 216,523
Residential |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 49,349 |  |  |  |  |  | 52,180 |  | 49,349 |  | 52,180 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 1,918 |  | 3,255 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (3,197) |  | (7,700) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 2,647 |  | 1,614 |  |
Net (charge-offs)/recoveries |  |  |  |  |  |  |  |  |  |  |  |  | (550) |  | (6,086) |  |
Ending balance | 50,717 |  |  |  |  |  | 49,349 |  |  |  |  |  | 50,717 |  | 49,349 |  |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 1,546 |  |  |  |  |  | 3,131 |  |  |  |  |  | 1,546 |  | 3,131 |  |
Loans collectively evaluated for impairment | 49,171 |  |  |  |  |  | 46,218 |  |  |  |  |  | 49,171 |  | 46,218 |  |
Ending balance | 50,717 |  |  |  |  |  | 49,349 |  |  |  |  |  | 50,717 |  | 49,349 |  |
Commercial Real Estate ("CRE") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 69,856 |  |  |  |  |  | 66,457 |  | 69,856 |  | 66,457 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | (6,615) |  | 20,977 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (3,357) |  | (27,060) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 4,793 |  | 9,482 |  |
Net (charge-offs)/recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 1,436 |  | (17,578) |  |
Ending balance | 64,677 |  |  |  |  |  | 69,856 |  |  |  |  |  | 64,677 |  | 69,856 |  |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 8,058 |  |  |  |  |  | 5,561 |  |  |  |  |  | 8,058 |  | 5,561 |  |
Loans collectively evaluated for impairment | 56,619 |  |  |  |  |  | 64,295 |  |  |  |  |  | 56,619 |  | 64,295 |  |
Ending balance | 64,677 |  |  |  |  |  | 69,856 |  |  |  |  |  | 64,677 |  | 69,856 |  |
Commercial and Industrial ("C&I") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 105,376 |  |  |  |  |  | 87,020 |  | 105,376 |  | 87,020 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 12,821 |  | 35,204 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (7,405) |  | (21,818) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 4,392 |  | 4,970 |  |
Net (charge-offs)/recoveries |  |  |  |  |  |  |  |  |  |  |  |  | (3,013) |  | (16,848) |  |
Ending balance | 115,184 |  |  |  |  |  | 105,376 |  |  |  |  |  | 115,184 |  | 105,376 |  |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans individually evaluated for impairment | 14,539 |  |  |  |  |  | 2,835 |  |  |  |  |  | 14,539 |  | 2,835 |  |
Loans collectively evaluated for impairment | 100,645 |  |  |  |  |  | 102,541 |  |  |  |  |  | 100,645 |  | 102,541 |  |
Ending balance | 115,184 |  |  |  |  |  | 105,376 |  |  |  |  |  | 115,184 |  | 105,376 |  |
Consumer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 4,801 |  |  |  |  |  | 4,219 |  | 4,801 |  | 4,219 |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 8,055 |  | 2,295 |  |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (2,385) |  | (1,824) |  |
Recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 881 |  | 111 |  |
Net (charge-offs)/recoveries |  |  |  |  |  |  |  |  |  |  |  |  | (1,504) |  | (1,713) |  |
Ending balance | 11,352 |  |  |  |  |  | 4,801 |  |  |  |  |  | 11,352 |  | 4,801 |  |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans collectively evaluated for impairment | 11,352 |  |  |  |  |  | 4,801 |  |  |  |  |  | 11,352 |  | 4,801 |  |
Ending balance | 11,352 |  |  |  |  |  | 4,801 |  |  |  |  |  | 11,352 |  | 4,801 |  |
Covered Loans under ASC 310-10 Subject to Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  | 5,153 | [2] |  |  |  |  | 6,647 | [2] | 5,153 | [2] | 6,647 | [2] |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 1,759 | [2] | 5,016 | [2] |
Charge-offs |  |  |  |  |  |  |  |  |  |  |  |  | (1,436) | [2] | (6,510) | [2] |
Net (charge-offs)/recoveries |  |  |  |  |  |  |  |  |  |  |  |  | (1,436) | [2] | (6,510) | [2] |
Ending balance | 5,476 | [2] |  |  |  |  | 5,153 | [2] |  |  |  |  | 5,476 | [2] | 5,153 | [2] |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans collectively evaluated for impairment | 5,476 | [2] |  |  |  |  | 5,153 | [2] |  |  |  |  | 5,476 | [2] | 5,153 | [2] |
Ending balance | 5,476 | [2] |  |  |  |  | 5,153 | [2] |  |  |  |  | 5,476 | [2] | 5,153 | [2] |
Covered Loans under ASC 310-30 Subject to Allowance for Loan Losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 2,269 |  |  |  |
Ending balance | 2,269 |  |  |  |  |  |  |  |  |  |  |  | 2,269 |  |  |  |
Ending balance allocated to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covered loans acquired with deteriorated credit quality | 2,269 | [1] |  |  |  |  |  |  |  |  |  |  | 2,269 | [1] |  |  |
Ending balance | 2,269 |  |  |  |  |  |  |  |  |  |  |  | 2,269 |  |  |  |
Unallocated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses Roll Forward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | 2,157 |  | (1,563) |  |
Allowance for unfunded loan commitments and letters of credit |  |  |  |  |  |  |  |  |  |  |  |  | $ (2,157) |  | $ 1,563 |  |
[1] | The Company has elected to account for covered loans acquired in the FDIC-assisted acquisitions under ASC 310-30, excluding any additional advances subsequent to acquisition date.
[2] | 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 Reflects the amount charged against earnings during the period as credit losses (bad debt expense) for unfunded loan commitments and letters of credit during the period. + References No definition available. + Details
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- Definition Represents the amount charged against earnings during the period as credit losses, net of amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: 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 + Details
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