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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Jan. 17, 2014 MetroCorp | Sep. 30, 2014 Premiums on acquired deposits | Sep. 30, 2013 Premiums on acquired deposits | Sep. 30, 2014 Premiums on acquired deposits | Sep. 30, 2013 Premiums on acquired deposits | Dec. 31, 2013 Premiums on acquired deposits
GOODWILL AND OTHER INTANGIBLE ASSETS |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 458,467,000 | $ 337,438,000 | $ 458,467,000 | $ 337,438,000 | $ 337,438,000 | $ 121,000,000 |  |  |  |  |
Premiums on Acquired Deposits |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount of premiums on acquired deposits |  |  |  |  |  |  | 108,800,000 |  | 108,800,000 |  | 100,200,000
Intangible recorded due to the acquisition of MetroCorp |  |  |  |  |  | 8,600,000 |  |  |  |  |
Accumulated amortization for premiums on acquired deposits |  |  |  |  |  |  | 61,000,000 |  | 61,000,000 |  | 53,300,000
Amortization expense of premiums on acquired deposits | 2,597,000 | 2,347,000 | 7,721,000 | 7,131,000 |  |  | 2,600,000 | 2,300,000 | 7,700,000 | 7,100,000 |
Estimated Future Amortization Expense of Premiums on Acquired Deposits |  |  |  |  |  |  |  |  |  |  |
Three Months Ending December 31, 2014 | 2,483,000 |  | 2,483,000 |  |  |  |  |  |  |  |
Year Ending December 31, 2015 | 9,234,000 |  | 9,234,000 |  |  |  |  |  |  |  |
Year Ending December 31, 2016 | 8,086,000 |  | 8,086,000 |  |  |  |  |  |  |  |
Year Ending December 31, 2017 | 6,935,000 |  | 6,935,000 |  |  |  |  |  |  |  |
Year Ending December 31, 2018 | 5,883,000 |  | 5,883,000 |  |  |  |  |  |  |  |
Thereafter | 15,171,000 |  | 15,171,000 |  |  |  |  |  |  |  |
Total | $ 47,792,000 |  | $ 47,792,000 |  |  |  |  |  |  |  |

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