BUSINESS COMBINATIONS (Details) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Oct. 01, 2018 USD ($) item	May 31, 2018 USD ($) item $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	May 18, 2018 USD ($)	Aug. 31, 2016 USD ($)	Apr. 29, 2016 USD ($)
Business Acquisition [Line Items]
Assets			$ 1,318,040	$ 985,367
Net cash paid			$ (4,768)
FFNM acquisition (in shares) | shares			2,146,378
FFNM acquisition			$ 34,101
Purchase Price:
Shares outstanding (in Shares) | shares			10,712,745	6,294,930
Net assets acquired:
Goodwill	$ 22,024		$ 22,024	$ 5,694
Unaudited proforma results
Net interest income			50,787	49,728
Noninterest income			5,071	6,366
Noninterest expense			47,529	49,360
Net income			$ 8,329	$ 6,734
Net income per diluted share | $ / shares			$ 0.75	$ 0.80
Eagle River
Net assets acquired:
Goodwill							$ 1,839
Niagara Bancorporation
Net assets acquired:
Goodwill						$ 50
FFNM
Business Acquisition [Line Items]
Number of banking offices | item		7
Purchase Price:
Shares outstanding (in Shares) | shares		3,726,925
Price per share / Cash Price | $ / shares		$ 9.15
Purchase price		$ 34,101
Net assets acquired:
Cash and cash equivalents		13,267
Securities available for sale		96,297
FHLB Stock		1,748
Total loans		185,444			$ 192,000
Premises and equipment		5,134
Other real estate owned		194
Deposit based intangible		2,894
Mortgage service rights		386
Deferred tax assets		2,844
Bank owned life insurance		5,170
Other assets		1,775
Total assets		315,153
Non-interest bearing deposits		60,616
Interest bearing deposits		193,099
Total deposits		253,715			254,000
FHLB Borrowings		40,722
Deferred tax liability		133
Other liabilities		1,397
Total liabilities		295,967
Net assets acquired		19,186
Goodwill		$ 14,915			14,915
FFNM | Minimum
Business Acquisition [Line Items]
Assets					$ 318,000
Lincoln Community Bank
Business Acquisition [Line Items]
Cash consideration	$ 8,500
Number of banking offices | item	2
Assets	$ 60,000
Net cash paid	8,500
Net assets acquired:
Cash and cash equivalents	10,971
Securities available for sale	6,947
Total loans	38,001
Premises and equipment	1,249
Other real estate owned	69
Deposit based intangible	1,353
Bank owned life insurance	1,653
Other assets	339
Total assets	60,582
Non-interest bearing deposits	15,559
Interest bearing deposits	37,654
Total deposits	53,213
Deferred tax liability	231
Other liabilities	53
Total liabilities	53,497
Net assets acquired	7,085
Goodwill	$ 1,415
PARENT COMPANY
Business Acquisition [Line Items]
Assets			$ 153,292	$ 101,445
Purchase Price:
Shares outstanding (in Shares) | shares			10,712,745	6,294,930
Purchase price			$ 8,500
Shares of Common Stock
Business Acquisition [Line Items]
FFNM acquisition (in shares) | shares			2,146,378
Common Stock and Additional Paid in Capital
Business Acquisition [Line Items]
FFNM acquisition			$ 34,101