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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010
GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract] |  |  |  |  |
Goodwill | $ 337,438,000 | $ 337,438,000 | $ 337,438,000 | $ 337,438,000 | $ 337,438,000
Market capitalization | 2,940,000,000 |  | 2,940,000,000 |  |
Total stockholders' equity | 2,230,000,000 |  | 2,230,000,000 |  |
Premiums on Acquired Deposits [Abstract] |  |  |  |  |
Premiums on acquired deposits | 117,600,000 |  | 117,600,000 |  | 117,600,000
Accumulated amortization for premiums on acquired deposits | 44,500,000 |  | 44,500,000 |  | 38,100,000
Amortization expense of premiums on acquired deposits | 3,151,000 | 3,310,000 | 6,336,000 | 6,694,000 |
Estimated Future Amortization Expense of Premiums on Acquired Deposits [Abstract] |  |  |  |  |
Six Months Ending December 31, 2011 |  |  | 6,120,000 |  |
Year Ending December 31, 2012 |  |  | 11,176,000 |  |
Year Ending December 31, 2013 |  |  | 9,660,000 |  |
Year Ending December 31, 2014 |  |  | 8,775,000 |  |
Year Ending December 31, 2015 |  |  | 7,784,000 |  |
Thereafter |  |  | 29,667,000 |  |
Total |  |  | $ 73,182,000 |  |

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