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ACQUISITIONS (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 24, 2015 USD ($) Branch | Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Goodwill |  | $ 375,174 | $ 375,174 | $ 375,174 | $ 375,174
Merger and acquisition integration-related expenses |  | $ 600 | $ 1,300 | $ 100 |
Other Intangibles [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful life of core deposit intangible and other intangible |  | 8 years |  |  |
EBS-RMSCO, Inc. [Member] |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |
Cash/Total net consideration paid |  |  |  |  | 924
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Other assets |  |  |  |  | 163
Other intangibles |  |  |  |  | 578
Total identifiable assets |  |  |  |  | 741
Goodwill |  |  |  |  | $ 183
Oneida Financial Corp [Member] |  |  |  |  |
Consideration paid [Abstract] |  |  |  |  |
Cash/Total net consideration paid | $ 142,000 |  |  |  |
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |
Number of new branch locations included in acquisition or purchase agreement | Branch | 12 |  |  |  |
Assets acquired | $ 813,000 |  |  |  |
Loans acquired | 397,000 |  |  |  |
Deposits acquired | $ 708,000 |  |  |  |

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