LOANS (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Loans
Total loans	$ 808,149,000	$ 756,804,000	$ 781,857,000
Changes in the allowance for loan losses
Net charge off activity	290,000	492,000
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	924,000	1,768,000
Accretion	(835,000)	(525,000)
Reclassification from nonaccretable difference	215,000	80,000
Balance at the end of period	304,000	1,163,000
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
Balance at the beginning of period	1,457,000
Acquisition		2,091,000
Accretion	(516,000)	(299,000)
Reclassification from nonaccretable difference	37,000	54,000
Balance at the end of period	978,000	1,738,000
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
Balance at the beginning of period	557,000
Acquisition		688,000
Accretion	(179,000)	(49,000)
Reclassification from nonaccretable difference	(1,000)
Balance at the end of period	377,000	639,000
Commercial real estate
Loans
Total loans	409,269,000	362,858,000	389,420,000
Commercial, financial, and agricultural
Loans
Total loans	154,638,000	136,065,000	142,648,000
Commercial construction
Loans
Total loans	8,892,000	14,343,000	11,505,000
One to four family residential real estate
Loans
Total loans	204,419,000	211,072,000	205,945,000
Consumer
Loans
Total loans	18,247,000	20,698,000	20,113,000
Consumer construction
Loans
Total loans	12,684,000	11,768,000	$ 12,226,000
Acquired Impaired
Acquired portfolio
Accretion	(370,000)	(96,000)
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	282,000	426,000
Accretion	(310,000)
Reclassification from nonaccretable difference	215,000	80,000
Balance at the end of period	187,000	346,000
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
Balance at the beginning of period	236,000
Acquisition		391,000
Accretion	(50,000)
Reclassification from nonaccretable difference	37,000	54,000
Balance at the end of period	223,000	337,000
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
Balance at the beginning of period	52,000
Acquisition		88,000
Accretion	(10,000)
Reclassification from nonaccretable difference	(1,000)
Balance at the end of period	41,000	88,000
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	642,000	1,342,000
Accretion	(525,000)	(525,000)
Balance at the end of period	117,000	817,000
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
Balance at the beginning of period	1,221,000
Acquisition		1,700,000
Accretion	(466,000)	(299,000)
Balance at the end of period	755,000	1,401,000
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
Balance at the beginning of period	505,000
Acquisition		600,000
Accretion	(169,000)	(49,000)
Balance at the end of period	$ 336,000	$ 551,000