OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Premises and Equipment, Goodwill, Intangible Assets, and Investments in Limited Partnerships (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) partnership	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Premises and equipment
Goodwill impairment loss	$ 0	$ 0	$ 0
Investment in Limited Partnerships
Number of partnerships held by entity | partnership	4
Carrying value of investments in limited partnerships	$ 899,000	1,560,000
Tax credit receipt period over which investment in the partnership entered into after 2004 are being fully amortized	10 years
Amortization of investment in limited partnerships	$ 661,000	$ 661,000	$ 661,000
Furniture, fixtures, and equipment | Minimum
Premises and equipment
Estimated useful lives (in years)	5 years
Furniture, fixtures, and equipment | Maximum
Premises and equipment
Estimated useful lives (in years)	10 years
Buildings and improvements | Minimum
Premises and equipment
Estimated useful lives (in years)	15 years
Buildings and improvements | Maximum
Premises and equipment
Estimated useful lives (in years)	40 years
Luzerne National Bank Corporation
Finite-Lived Intangible Assets [Line Items]
Intangible assets net	$ 1,240,000
Accumulated amortization	$ 774,000
Useful life (in years)	10 years