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INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Current tax expense [Abstract] |  |  |
Federal | $ 85,875 | $ 108,639 | $ 127,025
State | 9,212 | 23,101 | 24,868
Total current tax expense | 95,087 | 131,740 | 151,893
Deferred Income Tax Expense (Benefit) [Abstract] |  |  |
Federal | (27,344) | (12,127) | (33,333)
State | (7,921) | (4,510) | (8,042)
Total deferred tax expense (benefit) | (35,265) | (16,637) | (41,375)
Total income tax expense | 59,822 | 115,103 | 110,518
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Federal statutory rate | 35.00% |  |
Income taxes at statutory rates | 67,959 | 108,546 | 106,247
Increase (reduction) in income taxes resulting from: [Abstract] |  |  |
Nontaxable income on loans, leases and investments, net of nondeductible expenses | (1,309) | (1,481) | (1,571)
State and local income taxes, including change in valuation allowance, net of federal income tax benefit | 839 | 12,084 | 10,937
Tax credits | (7,279) | (5,166) | (4,141)
Other, net | (388) | 1,120 | (954)
Total income tax expense | 59,822 | 115,103 | 110,518
Income tax expense reduction, resulting from favorable outcome of state tax audits | 6,449 |  |
Deferred Tax Assets, Net [Abstract] |  |  |
Allowance for loan and lease losses | 124,928 | 105,788 |
Pension | 46,178 | 25,112 |
Executive separation from service agreements | 10,123 | 10,019 |
State operating loss carryforwards | 652 | 1,350 |
Unrealized loss on cash flow hedge | 4,106 | 4,231 |
Other | 19,465 | 17,638 |
Gross deferred tax asset | 205,452 | 164,138 |
Less valuation allowance | 0 | 73 |
Deferred tax assets | 205,452 | 164,065 |
Accelerated depreciation | 12,465 | 14,494 |
Lease financing activities | 10,366 | 11,334 |
Net unrealized gains on securities included in accumulated other comprehensive loss | 13,292 | 10,450 |
Net deferred loan fees and costs | 3,714 | 3,420 |
Intangible assets | 11,897 | 11,681 |
Gain on FDIC-assisted transactions, deferred for tax purposes | 29,694 | 34,208 |
Other | 5,373 | 5,079 |
Deferred tax liability | 86,801 | 90,666 |
Net deferred tax assets | $ 118,651 | $ 73,399 |
Years State Income Tax Returns Are Subject To Examination | 4 years |  |

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- Definition The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(1) -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. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration