LOANS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loans
Total loans	$ 781,857,000	$ 618,394,000
Acquired portfolio
Balance at the beginning of period	1,768,000	2,786,000
Accretion		(1,278,000)
Reclassification from nonaccretable difference		260,000
Balance at the end of period		1,768,000
PFC
Acquired portfolio
Loans acquired - contractual payments	67,139,000
Nonaccretable difference	(2,234,000)
Expected cash flows	64,905,000
Accretable yield	(2,844,000)
Carrying balance at acquisition date	62,061,000
Balance at the beginning of period	1,768,000
Accretion	(750,000)
Reclassification from nonaccretable difference	94,000
Balance at the end of period	924,000	1,768,000
Eagle River
Acquired portfolio
Loans acquired - contractual payments	84,138,000
Nonaccretable difference	(1,172,000)
Expected cash flows	82,966,000
Accretable yield	(2,091,000)
Carrying balance at acquisition date	80,875,000
Acquisition	2,091,000
Accretion	(525,000)
Reclassification from nonaccretable difference	109,000
Balance at the end of period	1,457,000
Niagara Bancorporation
Acquired portfolio
Loans acquired - contractual payments	32,660,000
Nonaccretable difference	(265,000)
Expected cash flows	32,395,000
Accretable yield	(688,000)
Carrying balance at acquisition date	31,707,000
Acquisition	688,000
Accretion	(95,000)
Reclassification from nonaccretable difference	36,000
Balance at the end of period	557,000
Commercial real estate
Loans
Total loans	389,420,000	312,805,000
Commercial, financial, and agricultural
Loans
Total loans	142,648,000	122,140,000
Commercial construction
Loans
Total loans	11,505,000	15,330,000
One to four family residential real estate
Loans
Total loans	205,945,000	140,502,000
Consumer
Loans
Total loans	20,113,000	15,847,000
Consumer construction
Loans
Total loans	12,226,000	11,770,000
Acquired impaired
Acquired portfolio
Balance at the beginning of period	426,000	744,000
Accretion	(96,000)	(578,000)
Reclassification from nonaccretable difference		260,000
Balance at the end of period		426,000
Acquired impaired | PFC
Acquired portfolio
Loans acquired - contractual payments	13,290,000
Nonaccretable difference	(2,234,000)
Expected cash flows	11,056,000
Accretable yield	(744,000)
Carrying balance at acquisition date	10,312,000
Balance at the beginning of period	426,000
Accretion	(50,000)
Reclassification from nonaccretable difference	94,000
Balance at the end of period	282,000	426,000
Acquired impaired | Eagle River
Acquired portfolio
Loans acquired - contractual payments	3,401,000
Nonaccretable difference	(1,172,000)
Expected cash flows	2,229,000
Accretable yield	(391,000)
Carrying balance at acquisition date	1,838,000
Acquisition	391,000
Accretion	(46,000)
Reclassification from nonaccretable difference	109,000
Balance at the end of period	236,000
Acquired impaired | Niagara Bancorporation
Acquired portfolio
Loans acquired - contractual payments	2,105,000
Nonaccretable difference	(265,000)
Expected cash flows	1,840,000
Accretable yield	(88,000)
Carrying balance at acquisition date	1,752,000
Acquisition	88,000
Reclassification from nonaccretable difference	36,000
Balance at the end of period	52,000
Acquired Non-impaired
Acquired portfolio
Balance at the beginning of period	1,342,000	2,042,000
Accretion		(700,000)
Balance at the end of period		1,342,000
Acquired Non-impaired | PFC
Acquired portfolio
Loans acquired - contractual payments	53,849,000
Expected cash flows	53,849,000
Accretable yield	(2,100,000)
Carrying balance at acquisition date	51,749,000
Balance at the beginning of period	1,342,000
Accretion	(700,000)
Balance at the end of period	642,000	$ 1,342,000
Acquired Non-impaired | Eagle River
Acquired portfolio
Loans acquired - contractual payments	80,737,000
Expected cash flows	80,737,000
Accretable yield	(1,700,000)
Carrying balance at acquisition date	79,037,000
Acquisition	1,700,000
Accretion	(479,000)
Balance at the end of period	1,221,000
Acquired Non-impaired | Niagara Bancorporation
Acquired portfolio
Loans acquired - contractual payments	30,555,000
Expected cash flows	30,555,000
Accretable yield	(600,000)
Carrying balance at acquisition date	29,955,000
Acquisition	600,000
Accretion	(95,000)
Balance at the end of period	$ 505,000