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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 50,345 | $ 49,767 |
Accumulated Amortization | (37,553) | (34,259) |
Net Carrying Amount | 12,792 | 15,508 |
Estimated aggregate amortization expense [Abstract] |  |  |
Oct - Dec 2014 | 993 |  |
2015 | 3,408 |  |
2016 | 2,612 |  |
2017 | 1,908 |  |
2018 | 1,424 |  |
Thereafter | 2,447 |  |
Net Carrying Amount | 12,792 | 15,508 |
Components of goodwill [Abstract] |  |  |
Goodwill | 379,998 | 379,815 |
Goodwill, Activity | 183 |  |
Accumulated impairment | (4,824) | (4,824) |
Accumulated impairment, Activity | 0 |  |
Goodwill, net | 375,174 | 374,991 | 369,703
Goodwill, net, Activity | 183 |  |
Core Deposit Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 40,326 | 40,326 |
Accumulated Amortization | (29,510) | (26,866) |
Net Carrying Amount | 10,816 | 13,460 |
Estimated aggregate amortization expense [Abstract] |  |  |
Net Carrying Amount | 10,816 | 13,460 |
Other Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 10,019 | 9,441 |
Accumulated Amortization | (8,043) | (7,393) |
Net Carrying Amount | 1,976 | 2,048 |
Estimated aggregate amortization expense [Abstract] |  |  |
Net Carrying Amount | $ 1,976 | $ 2,048 |

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