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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 58,046 | $ 45,288 |
Accumulated amortization | (37,152) | (33,489) |
Net carrying amount | 20,894 | 11,799 |
Finite-lived intangible assets, future amortization expense [Abstract] |  |  |
2016 | 5,415 |  |
2017 | 4,357 |  |
2018 | 3,518 |  |
2019 | 2,742 |  |
2020 | 2,087 |  |
Thereafter | 2,775 |  |
Net carrying amount | 20,894 | 11,799 |
Components of goodwill [Abstract] |  |  |
Goodwill | 468,076 | 379,998 | $ 379,815
Goodwill, activity | 88,078 | 183 |
Accumulated impairment | (4,824) | (4,824) | (4,824)
Accumulated impairment, activity | 0 | 0 |
Goodwill, net | 463,252 | 375,174 | $ 374,991
Goodwill, net, activity | 88,078 | 183 |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Carrying value before valuation allowance at beginning of period | 1,089 | 1,218 |
Additions | 403 | 315 |
Oneida acquisition | 389 | 0 |
Amortization | (409) | (444) |
Carrying value before valuation allowance at end of period | 1,472 | 1,089 |
Valuation allowance balance at beginning of period | 0 | 0 |
Impairment charges | (133) | 0 |
Impairment recoveries | 133 | 0 |
Valuation allowance balance at end of period | 0 | 0 |
Net carrying value at end of period | 1,472 | 1,089 |
Fair value of MSRs at end of period | 1,962 | 1,616 |
Principal balance of loans sold during the year | 35,491 | 25,728 |
Principal balance of loans serviced for others | 377,909 | 302,895 |
Custodial escrow balances maintained in connection with loans serviced for others | $ 5,700 | $ 4,320 |
Key economic assumptions used to estimate the value of the MSRs [Abstract] |  |  |
Weighted-average contractual life | 19 years 10 months 24 days | 19 years 7 months 6 days |
Weighted-average constant prepayment rate (CPR) | 14.90% | 12.80% |
Weighted-average discount rate | 3.30% | 3.20% |
Core Deposit Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 40,481 | $ 37,911 |
Accumulated amortization | (30,692) | (27,888) |
Net carrying amount | 9,789 | 10,023 |
Finite-lived intangible assets, future amortization expense [Abstract] |  |  |
Net carrying amount | 9,789 | 10,023 |
Other Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 17,565 | 7,377 |
Accumulated amortization | (6,460) | (5,601) |
Net carrying amount | 11,105 | 1,776 |
Finite-lived intangible assets, future amortization expense [Abstract] |  |  |
Net carrying amount | $ 11,105 | $ 1,776 |

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