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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2013 Premiums on acquired deposits | Mar. 31, 2012 Premiums on acquired deposits | Dec. 31, 2012 Premiums on acquired deposits
GOODWILL AND OTHER INTANGIBLE ASSETS |  |  |  |  |  |  |
Goodwill | $ 337,438,000 | $ 337,438,000 | $ 337,438,000 |  |  |  |
Market capitalization | 3,650,000,000 |  |  |  |  |  |
Total stockholders' equity | 2,343,119,000 | 2,382,122,000 | 2,283,297,000 | 2,311,743,000 |  |  |
Premiums on Acquired Deposits |  |  |  |  |  |  |
Premiums on acquired deposits |  |  |  |  | 100,200,000 |  | 100,200,000
Accumulated amortization for premiums on acquired deposits |  |  |  |  | 46,300,000 |  | 43,900,000
Amortization expense of premiums on acquired deposits |  |  |  |  | 2,400,000 | 2,900,000 |
Estimated Future Amortization Expense of Premiums on Acquired Deposits |  |  |  |  |  |  |
Remainder of the year |  |  |  |  | 6,955,000 |  |
Year Ending December 31, 2014 |  |  |  |  | 8,454,000 |  |
Year Ending December 31, 2015 |  |  |  |  | 7,543,000 |  |
Year Ending December 31, 2016 |  |  |  |  | 6,634,000 |  |
Year Ending December 31, 2017 |  |  |  |  | 5,722,000 |  |
Thereafter |  |  |  |  | 18,567,000 |  |
Total |  |  |  |  | $ 53,875,000 |  |

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