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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 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 | 2,440,000,000 |  | 2,440,000,000 |  |
Total stockholders' equity | 2,260,000,000 |  | 2,260,000,000 |  |
Premiums on acquired deposits | 117,600,000 |  | 117,600,000 |  | 117,600,000
Accumulated amortization for premiums on acquired deposits | 47,500,000 |  | 47,500,000 |  | 38,100,000
Amortization expense of premiums on acquired deposits | 3,067,000 | 3,352,000 | 9,403,000 | 10,046,000 |
Estimated Future Amortization Expense of Premiums on Acquired Deposits [Abstract] |  |  |  |  |
Three Months Ending December 31, 2011 |  |  | 2,924,000 |  |
Year Ending December 31, 2012 |  |  | 10,906,000 |  |
Year Ending December 31, 2013 |  |  | 9,365,000 |  |
Year Ending December 31, 2014 |  |  | 8,454,000 |  |
Year Ending December 31, 2015 |  |  | 7,543,000 |  |
Thereafter |  |  | 30,923,000 |  |
Total |  |  | $ 70,115,000 |  |

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