LOANS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Loans
Total loans	$ 812,441	$ 786,546	$ 811,078
Changes in the allowance for loan losses
Net charge off activity	28	24
PFC
Acquired portfolio
Loans acquired - contractual payments	67,139
Nonaccretable difference	(2,234)
Expected cash flows	64,905
Accretable yield	(2,844)
Carrying balance at acquisition date	62,061
Balance at the beginning of period	149	924
Accretion	(30)	(275)
Reclassification from nonaccretable difference	23	(57)
Balance at the end of period	142	706
Eagle River
Acquired portfolio
Loans acquired - contractual payments	84,138
Nonaccretable difference	(1,172)
Expected cash flows	82,966
Accretable yield	(2,091)
Carrying balance at acquisition date	80,875
Balance at the beginning of period	821	1,457
Accretion	(150)	(179)
Balance at the end of period	671	1,278
Niagara Bancorporation
Acquired portfolio
Loans acquired - contractual payments	32,660
Nonaccretable difference	(265)
Expected cash flows	32,395
Accretable yield	(688)
Carrying balance at acquisition date	31,707
Balance at the beginning of period	319	557
Accretion	(54)	(72)
Reclassification from nonaccretable difference		8
Balance at the end of period	265	477
Commercial real estate
Loans
Total loans	411,526	397,192	406,742
Commercial, financial, and agricultural
Loans
Total loans	160,188	144,673	156,951
Commercial construction
Loans
Total loans	8,004	10,618	9,243
One to four family residential real estate
Loans
Total loans	204,542	202,654	209,890
Consumer
Loans
Total loans	16,919	19,021	17,434
Consumer construction
Loans
Total loans	11,262	12,388	$ 10,818
Acquired Impaired
Acquired portfolio
Accretion	(50)	(100)
Acquired Impaired | PFC
Acquired portfolio
Loans acquired - contractual payments	13,290
Nonaccretable difference	(2,234)
Expected cash flows	11,056
Accretable yield	(744)
Carrying balance at acquisition date	10,312
Balance at the beginning of period	149	282
Accretion	(30)	(100)
Reclassification from nonaccretable difference	23	(57)
Balance at the end of period	142	239
Acquired Impaired | Eagle River
Acquired portfolio
Loans acquired - contractual payments	3,401
Nonaccretable difference	(1,172)
Expected cash flows	2,229
Accretable yield	(391)
Carrying balance at acquisition date	1,838
Balance at the beginning of period	218	236
Balance at the end of period	218	236
Acquired Impaired | Niagara Bancorporation
Acquired portfolio
Loans acquired - contractual payments	2,105
Nonaccretable difference	(265)
Expected cash flows	1,840
Accretable yield	(88)
Carrying balance at acquisition date	1,752
Balance at the beginning of period	38	52
Reclassification from nonaccretable difference		8
Balance at the end of period	38	44
Acquired Non-impaired | PFC
Acquired portfolio
Loans acquired - contractual payments	53,849
Expected cash flows	53,849
Accretable yield	(2,100)
Carrying balance at acquisition date	51,749
Balance at the beginning of period		642
Accretion		(175)
Balance at the end of period		467
Acquired Non-impaired | Eagle River
Acquired portfolio
Loans acquired - contractual payments	80,737
Expected cash flows	80,737
Accretable yield	(1,700)
Carrying balance at acquisition date	79,037
Balance at the beginning of period	603	1,221
Accretion	(150)	(179)
Balance at the end of period	453	1,042
Acquired Non-impaired | Niagara Bancorporation
Acquired portfolio
Loans acquired - contractual payments	30,555
Expected cash flows	30,555
Accretable yield	(600)
Carrying balance at acquisition date	29,955
Balance at the beginning of period	281	505
Accretion	(54)	(72)
Balance at the end of period	$ 227	$ 433