SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Nature of Operations [Abstract]
Number of bank branches	179
Number of counties in New York where the bank has facilities	35
Number of counties in Pennsylvania where the bank has facilities	5
Impaired and Other Nonaccrual Loans [Abstract]
Number of days past due for loans to be placed on nonaccrual status	90 days
Threshold amount of individual commercial loans evaluated for impairment	$ 0.5
Intangible assets [Abstract]
Intangible asset useful life (amortization period), minimum (in years)	7
Intangible asset useful life (amortization period), maximum (in years)	20
Premises and Equipment [Abstract]
Other real estate	4.8	2.7
Advertising [Abstract]
Advertising costs	$ 2.5	$ 2.3	$ 2.0
Equipment [Member]
Premises and Equipment [Abstract]
Estimated useful life, minimum (in years)	5
Estimated useful life, maximum (in years)	10
Software and Hardware [Member]
Premises and Equipment [Abstract]
Estimated useful life, minimum (in years)	3
Estimated useful life, maximum (in years)	7
Building and Building Improvements [Member]
Premises and Equipment [Abstract]
Estimated useful life, minimum (in years)	10
Estimated useful life, maximum (in years)	40
Land Improvements [Member]
Premises and Equipment [Abstract]
Estimated useful life, maximum (in years)	15