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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 57,541 | $ 57,253 |
Accumulated amortization | (41,839) | (36,359) |
Net carrying amount | 15,702 | 20,894 |
Finite-lived intangible assets, future amortization expense [Abstract] |  |  |
2017 | 4,413 |  |
2018 | 3,566 |  |
2019 | 2,782 |  |
2020 | 2,119 |  |
2021 | 1,531 |  |
Thereafter | 1,291 |  |
Net carrying amount | 15,702 | 20,894 |
Components of goodwill [Abstract] |  |  |
Goodwill | 469,966 | 468,076 | $ 379,998
Goodwill, activity | 1,890 | 88,078 |
Accumulated impairment | (4,824) | (4,824) | (4,824)
Accumulated impairment, activity | 0 | 0 |
Goodwill, net | 465,142 | 463,252 | $ 375,174
Goodwill, net, activity | 1,890 | 88,078 |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Carrying value before valuation allowance at beginning of period | 1,472 | 1,089 |
Additions | 481 | 403 |
Oneida acquisition | 0 | 389 |
Amortization | (518) | (409) |
Carrying value before valuation allowance at end of period | 1,435 | 1,472 |
Valuation allowance balance at beginning of period | 0 | 0 |
Impairment charges | (226) | (133) |
Impairment recoveries | 226 | 133 |
Valuation allowance balance at end of period | 0 | 0 |
Net carrying value at end of period | 1,435 | 1,472 |
Fair value of MSRs at end of period | 1,928 | 1,962 |
Principal balance of loans sold during the year | 45,852 | 35,491 |
Principal balance of loans serviced for others | 365,374 | 377,909 |
Custodial escrow balances maintained in connection with loans serviced for others | $ 5,603 | $ 5,700 |
Key economic assumptions used to estimate the value of the MSRs [Abstract] |  |  |
Weighted-average contractual life | 20 years 9 months 18 days | 19 years 10 months 24 days |
Weighted-average constant prepayment rate (CPR) | 15.10% | 14.90% |
Weighted-average discount rate | 3.50% | 3.30% |
Core Deposit Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 39,688 | $ 39,688 |
Accumulated amortization | (32,581) | (29,899) |
Net carrying amount | 7,107 | 9,789 |
Finite-lived intangible assets, future amortization expense [Abstract] |  |  |
Net carrying amount | 7,107 | 9,789 |
Other Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 17,853 | 17,565 |
Accumulated amortization | (9,258) | (6,460) |
Net carrying amount | 8,595 | 11,105 |
Finite-lived intangible assets, future amortization expense [Abstract] |  |  |
Net carrying amount | $ 8,595 | $ 11,105 |

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