SHAREHOLDERS' EQUITY (Details) $ in Thousands	1 Months Ended	6 Months Ended		12 Months Ended
SHAREHOLDERS' EQUITY (Details) $ in Thousands	Aug. 28, 2019	Jun. 30, 2021 Program shares	Jun. 30, 2020 shares	Dec. 31, 2020 shares	Dec. 31, 2016 shares	Dec. 31, 2015 shares	Dec. 31, 2014 shares	Dec. 31, 2013 shares	Apr. 28, 2015 USD ($)	Dec. 17, 2013 USD ($)	Feb. 27, 2013 USD ($)
Participation in the TARP Capital Purchase Program
Number of share repurchase programs \| Program		1
Number of share repurchase program expired \| Program		1
Share Repurchase Program Expired
Participation in the TARP Capital Purchase Program
Amount authorized to be repurchased \| $										$ 600	$ 600
Additional amount authorized to be repurchased \| $									$ 750
Share Repurchase Program Two \| Maximum
Participation in the TARP Capital Purchase Program
Percentage of outstanding common stock authorized to repurchase	5.00%
Shares of Common Stock
Participation in the TARP Capital Purchase Program
Number of shares repurchased			(240,644)
Shares of Common Stock \| Share Repurchase Program Expired
Participation in the TARP Capital Purchase Program
Number of shares repurchased				1,661	14,000	102,455	13,700	55,594
Shares of Common Stock \| Share Repurchase Program Two
Participation in the TARP Capital Purchase Program
Number of shares repurchased		0	283,779

MACKINAC FINANCIAL CORP /MI/ 10-Q