BUSINESS COMBINATIONS (Details)	1 Months Ended			9 Months Ended
	Aug. 31, 2016 USD ($) item	Apr. 30, 2016 USD ($)	Apr. 29, 2016 USD ($) item	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Assets					$ 1,015,070,000	$ 983,520,000
Goodwill					$ 5,694,000	5,694,000
Purchase Price:
Cash consideration				$ 12,500,000
Eagle River
Business Acquisition [Line Items]
Number of banking offices | item			3
Assets			$ 125,000,000
Total loans		$ 84,000,000
Total deposits		105,000,000
Deposit based intangible		933,000
Total purchase price		12,500,000
Goodwill		$ 1,839,000				1,839,000
Niagara Bancorporation
Business Acquisition [Line Items]
Number of banking offices | item	4
Assets	$ 67,000,000
Total loans	33,000,000
Total deposits	59,000,000
Deposit based intangible	300,000
Net cash used in Eagle acquisition and reimbursement of contract termination fee	7,325,000
Goodwill	$ 50,000					$ 50,000