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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 Premiums on acquired deposits | Dec. 31, 2012 Premiums on acquired deposits | Dec. 31, 2011 Premiums on acquired deposits
GOODWILL AND OTHER INTANGIBLE ASSETS |  |  |  |  |  |  |
Goodwill | $ 337,438,000 |  | $ 337,438,000 |  |  |  |
Market capitalization | 4,810,000,000 |  |  |  |  |  |
Total stockholders' equity | 2,364,225,000 | 2,382,122,000 | 2,311,743,000 | 2,113,931,000 |  |  |
Number of business divisions | 3 |  |  |  |  |  |
Number of operating segments | 3 |  |  |  |  |  |
Period for which the company provided a net income projection under the income approach to determine the fair value of the reporting units | 3 years |  |  |  |  |  |
Goodwill impairment | 0 |  |  |  |  |  |
Changes in carrying amount of goodwill |  |  |  |  |  |  |
Balance, beginning of year | 337,438,000 |  | 337,438,000 |  |  |  |
Balance, end of year | 337,438,000 |  | 337,438,000 |  |  |  |
Premiums on Acquired Deposits |  |  |  |  |  |  |
Gross carrying amount of premiums on acquired deposits |  |  |  |  | 100,200,000 | 100,200,000 |
Accumulated amortization for premiums on acquired deposits |  |  |  |  | 53,300,000 | 43,900,000 |
Amortization expense of premiums on acquired deposits |  |  |  |  | 9,400,000 | 10,900,000 | 12,300,000
Estimated Future Amortization Expense of Premiums on Acquired Deposits |  |  |  |  |  |  |
2014 | 8,454,000 |  |  |  |  |  |
2015 | 7,543,000 |  |  |  |  |  |
2016 | 6,634,000 |  |  |  |  |  |
2017 | 5,722,000 |  |  |  |  |  |
2018 | 4,908,000 |  |  |  |  |  |
Thereafter | 13,659,000 |  |  |  |  |  |
Total | $ 46,920,000 |  |  |  |  |  |

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