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ACQUISITIONS (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 9 Months Ended |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2014 Core Deposits [Member] | Dec. 13, 2013 Bank of America Agreement [Member] Branch | Sep. 30, 2014 HSBC and First Niagara [Member] | Dec. 31, 2013 HSBC and First Niagara [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of new branch locations included in acquisition or purchase agreement |  |  |  |  |  | 8 |  |
Loans acquired |  |  |  |  |  | $ 1,000,000 |  |
Deposits acquired |  |  |  |  |  | 303,000,000 |  |
Blended deposit premium (in hundredths) |  |  |  |  |  | 2.40% |  |
Total deposit premium paid |  |  |  |  |  | 7,300,000 |  |
Consideration paid/(received): [Abstract] |  |  |  |  |  |  |  |
Cash/Total net consideration paid/(received) |  |  |  |  |  |  | 924,000 | (291,980,000)
Recognized amounts of identifiable assets acquired and liabilities assumed [Abstract] |  |  |  |  |  |  |  |
Loans |  |  |  |  |  |  | 0 | 1,106,000
Premises and equipment |  |  |  |  |  |  | 0 | 2,549,000
Accrued interest receivable |  |  |  |  |  |  | 0 | 5,000
Other assets and liabilities, net |  |  |  |  |  |  | 163,000 | (18,000)
Other intangibles |  |  |  |  |  |  | 578,000 | 9,000
Core deposit intangibles |  |  |  |  |  |  | 0 | 2,537,000
Deposits |  |  |  |  |  |  | 0 | (303,456,000)
Total identifiable assets/(liabilities), net |  |  |  |  |  |  | 741,000 | (297,268,000)
Goodwill | 375,174,000 | 375,174,000 | 374,991,000 | 369,703,000 |  |  | 183,000 | 5,288,000
Merger and acquisition - integration related expenses | $ 0 | $ 100,000 |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Estimated useful life of core deposit intangible and other intangible |  |  |  |  | 8 years |  |  |

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