BUSINESS COMBINATIONS (Details)		1 Months Ended		12 Months Ended
	Apr. 29, 2016 USD ($) item	Aug. 31, 2016 USD ($) item $ / shares shares	Apr. 30, 2016 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Assets				$ 983,520,000	$ 739,269,000
Purchase Price:
Shares outstanding (in Shares) | shares				6,263,371	6,217,620
Cash consideration						$ 4,484,000
Net assets acquired:
Goodwill				$ 5,694,000	$ 3,805,000
Eagle River
Business Acquisition [Line Items]
Number of banking offices | item	3
Assets	$ 125,000,000
Purchase Price:
Shares outstanding (in Shares) | shares			85,776,000
Price per share / Cash Price | $ / shares			$ 145.73
Total purchase price			$ 12,500,000
Reimbursement of termination fees			(1,763,000)
Cash consideration			10,737,000
Net assets acquired:
Cash and cash equivalents			10,600,000
Securities available for sale, net of purchase accounting marks			23,296,000
FRB & FHLB Stock			575,000
Total Loans, net of purchase accounting marks			80,875,000
Premises and equipment			1,931,000
Other real estate owned			904,000
Deposit based intangible			993,000
Mortgage service rights			120,000
Deferred tax benefit - book for valuation marks			948,000
Bank owned life insurance			4,132,000
Other assets			323,000
Total assets			124,697,000
Non-interest bearing deposits			22,349,000
Interest bearing deposits			82,165,000
Total deposits			104,514,000
FHLB Borrowings			11,000,000
Other liabilities			285,000
Total liabilities			115,799,000
Net assets acquired			8,898,000
Goodwill			$ 1,839,000	$ 1,839,000
Number of days included into the pro-forma results				245 days
Data processing termination fees				$ 1,763,000
Other related expenses				954,000
Merger transaction related expenses before tax				2,717,000
Merger transaction related expenses after tax				1,793,000
Niagara Bancorporation
Business Acquisition [Line Items]
Number of banking offices | item		4
Assets		$ 67,000,000
Purchase Price:
Shares outstanding (in Shares) | shares		4,354,000
Price per share / Cash Price | $ / shares		$ 1,682.36
Total purchase price		$ 7,325,000
Net assets acquired:
Cash and cash equivalents		9,778,000
Securities available for sale, net of purchase accounting marks		21,491,000
FRB & FHLB Stock		287,000
Total Loans, net of purchase accounting marks		31,707,000
Premises and equipment		926,000
Other real estate owned		301,000
Deposit based intangible		300,000
Mortgage service rights		87,000
Deferred tax benefit - book for valuation marks		397,000
Bank owned life insurance		1,109,000
Other assets		302,000
Total assets		66,685,000
Non-interest bearing deposits		5,396,000
Interest bearing deposits		53,788,000
Total deposits		59,184,000
Other liabilities		226,000
Total liabilities		59,410,000
Net assets acquired		7,275,000
Goodwill		$ 50,000		$ 50,000
Number of days included into the pro-forma results				122 days
Merger transaction related expenses before tax				$ 384,000
Merger transaction related expenses after tax				253,000
Eagle River and Niagara
Unaudited proforma results
Net interest income				36,902,000	32,924,000
Noninterest income				5,129,000	4,865,000
Noninterest expense				30,857,000	26,851,000
Net income				$ 7,375,000	$ 7,219,000
Net income per diluted share | $ / shares				$ 1.18	$ 1.15
PARENT COMPANY
Business Acquisition [Line Items]
Assets				$ 101,527,000	$ 87,753,000
Purchase Price:
Shares outstanding (in Shares) | shares				6,263,371	6,217,620
Cash consideration				$ 19,825,000		$ 4,484,000