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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2012 Premiums on acquired deposits | Mar. 31, 2011 Premiums on acquired deposits | Dec. 31, 2011 Premiums on acquired deposits
GOODWILL AND OTHER INTANGIBLE ASSETS |  |  |  |  |  |  |
Goodwill | $ 337,438,000 | $ 337,438,000 | $ 337,438,000 |  |  |  |
Market capitalization | 3,490,000,000 |  |  |  |  |  |
Total stockholders' equity | 2,283,297,000 | 2,311,743,000 | 2,157,917,000 | 2,113,931,000 |  |  |
Premiums on Acquired Deposits |  |  |  |  |  |  |
Premiums on acquired deposits |  |  |  |  | 115,200,000 |  | 117,600,000
Accumulated amortization for premiums on acquired deposits |  |  |  |  | 50,900,000 |  | 50,400,000
Amortization expense of premiums on acquired deposits |  |  |  |  | 2,900,000 | 3,200,000 |
Estimated Future Amortization Expense of Premiums on Acquired Deposits |  |  |  |  |  |  |
Remainder of the year |  |  |  |  | 8,033,000 |  |
Year Ending December 31, 2013 |  |  |  |  | 9,364,000 |  |
Year Ending December 31, 2014 |  |  |  |  | 8,454,000 |  |
Year Ending December 31, 2015 |  |  |  |  | 7,543,000 |  |
Year Ending December 31, 2016 |  |  |  |  | 6,634,000 |  |
Thereafter |  |  |  |  | 24,289,000 |  |
Total |  |  |  |  | $ 64,317,000 |  |

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