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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 50,539 | $ 50,345 |
Accumulated Amortization | (41,188) | (38,546) |
Net Carrying Amount | 9,351 | 11,799 |
Estimated aggregate amortization expense [Abstract] |  |  |
Oct - Dec 2015 | 788 |  |
2016 | 2,652 |  |
2017 | 1,943 |  |
2018 | 1,453 |  |
2019 | 1,026 |  |
Thereafter | 1,489 |  |
Net Carrying Amount | 9,351 | 11,799 |
Components of goodwill [Abstract] |  |  |
Goodwill | 379,998 | 379,998 |
Goodwill, Activity | 0 |  |
Accumulated impairment | (4,824) | (4,824) |
Accumulated impairment, Activity | 0 |  |
Goodwill, net | 375,174 | 375,174 | $ 375,174
Goodwill, net, Activity | 0 |  |
Core Deposit Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 40,326 | 40,326 |
Accumulated Amortization | (32,432) | (30,303) |
Net Carrying Amount | 7,894 | 10,023 |
Estimated aggregate amortization expense [Abstract] |  |  |
Net Carrying Amount | 7,894 | 10,023 |
Other Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 10,213 | 10,019 |
Accumulated Amortization | (8,756) | (8,243) |
Net Carrying Amount | 1,457 | 1,776 |
Estimated aggregate amortization expense [Abstract] |  |  |
Net Carrying Amount | $ 1,457 | $ 1,776 |

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