BUSINESS COMBINATIONS (Details) $ / shares in Units, $ in Thousands				1 Months Ended	12 Months Ended
	Oct. 01, 2018 USD ($) item	May 18, 2018 USD ($)	May 05, 2018 USD ($) shares	May 31, 2018 USD ($) item $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Business Acquisition [Line Items]
Assets					$ 1,320,069	$ 1,318,040
Net cash paid						$ (4,768)
FFNM acquisition (in shares) | shares						2,146,378
FFNM acquisition						$ 34,101
Purchase Price:
FFNM shares outstanding | shares					10,748,712	10,712,745
Net assets acquired:
Goodwill	$ 19,574				$ 19,574	$ 22,024
FFNM
Business Acquisition [Line Items]
Number of banking offices | item				7
Assets		$ 318,000
Increase deferred tax asset					1,950
Increase to MSRs		500
Decrease Goodwill					2,450
Purchase Price:
FFNM shares outstanding | shares				3,726,925
Price per share / Cash Price | $ / shares				$ 9.15
Total 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		192,000		185,444
Premises and equipment				5,134
Other real estate owned				194
Deposit based intangible				2,894
Mortgage service rights				886
Deferred tax assets				4,631
Bank owned life insurance				5,170
Other assets				1,775
Total assets				317,440
Non-interest bearing deposits				60,616
Interest bearing deposits				193,099
Total deposits		254,000		253,715
FHLB Borrowings				40,722
Deferred tax liability				133
Other liabilities				1,397
Total liabilities				295,967
Net assets acquired				21,473
Goodwill		$ 12,628		$ 12,628
Lincoln Community Bank
Business Acquisition [Line Items]
Number of banking offices | item	2
Assets	$ 60,000
Cash consideration	8,500
Decrease deferred tax liability					163
Decrease Goodwill					$ 163
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	68
Other liabilities	53
Total liabilities	53,334
Net assets acquired	7,248
Goodwill	$ 1,252
Shares of Common Stock
Business Acquisition [Line Items]
FFNM acquisition (in shares) | shares			2,146,378			2,146,378
Common Stock and Additional Paid in Capital
Business Acquisition [Line Items]
FFNM acquisition			$ 34,101			$ 34,101