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