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LOANS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Loans    
Total loans $ 1,058,776 $ 1,038,864
Acquired portfolio    
Acquired with deteriorated credit quality 8,974 6,093
Balance at the beginning of period 5,051 1,289
Acquisition activity   5,831
Accretion (2,235) (2,573)
Reclassification from nonaccretable difference 360 504
Balance at the end of period 3,176 5,051
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  
Acquired with deteriorated credit quality 1,718 2,369
Balance at the beginning of period 128 149
Accretion (90) (86)
Reclassification from nonaccretable difference 67 65
Balance at the end of period 105 128
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  
Acquired with deteriorated credit quality 1,716 1,963
Balance at the beginning of period 229 821
Accretion (33) (609)
Reclassification from nonaccretable difference 13 17
Balance at the end of period 209 229
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  
Acquired with deteriorated credit quality 75 237
Balance at the beginning of period 95 319
Accretion (99) (260)
Reclassification from nonaccretable difference 23 36
Balance at the end of period 19 95
FFNM    
Acquired portfolio    
Loans acquired - contractual payments 192,742  
Nonaccretable difference (2,100)  
Expected cash flows 190,642  
Accretable yield (5,198)  
Carrying balance at acquisition date 185,444  
Acquired with deteriorated credit quality 5,119 7,720
Balance at the beginning of period 4,017  
Acquisition activity   5,198
Accretion (1,707) (1,567)
Reclassification from nonaccretable difference 161 386
Balance at the end of period 2,471 4,017
Lincoln Community Bank    
Acquired portfolio    
Loans acquired - contractual payments 39,601  
Nonaccretable difference (421)  
Expected cash flows 39,180  
Accretable yield (633)  
Carrying balance at acquisition date 38,547  
Acquired with deteriorated credit quality 897 1,272
Balance at the beginning of period 582  
Acquisition activity   633
Accretion (306) (51)
Reclassification from nonaccretable difference 96  
Balance at the end of period 372 582
Commercial real estate    
Loans    
Total loans 514,394 496,207
Acquired portfolio    
Acquired with deteriorated credit quality 4,318 2,777
Commercial, financial, and agricultural    
Loans    
Total loans 211,023 191,060
Acquired portfolio    
Acquired with deteriorated credit quality 2,354 1,460
Commercial construction    
Loans    
Total loans 40,107 29,765
Acquired portfolio    
Acquired with deteriorated credit quality 373 366
One to four family residential real estate    
Loans    
Total loans 253,918 286,908
Acquired portfolio    
Acquired with deteriorated credit quality 1,920 1,231
Consumer    
Loans    
Total loans 21,238 20,371
Acquired portfolio    
Acquired with deteriorated credit quality 9 42
Consumer construction    
Loans    
Total loans 18,096 14,553
Acquired portfolio    
Acquired with deteriorated credit quality   217
Acquired Impaired    
Acquired portfolio    
Balance at the beginning of period 1,078 405
Acquisition activity   840
Accretion (479) (671)
Reclassification from nonaccretable difference 360 504
Balance at the end of period 959 1,078
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 128 149
Accretion (90) (86)
Reclassification from nonaccretable difference 67 65
Balance at the end of period 105 128
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 213 218
Accretion (17) (22)
Reclassification from nonaccretable difference 13 17
Balance at the end of period 209 213
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 26 38
Accretion (30) (48)
Reclassification from nonaccretable difference 23 36
Balance at the end of period 19 26
Acquired Impaired | FFNM    
Acquired portfolio    
Loans acquired - contractual payments 5,440  
Nonaccretable difference (2,100)  
Expected cash flows 3,340  
Accretable yield (700)  
Carrying balance at acquisition date 2,640  
Balance at the beginning of period 571  
Acquisition activity   700
Accretion (214) (515)
Reclassification from nonaccretable difference 161 386
Balance at the end of period 518 571
Acquired Impaired | Lincoln Community Bank    
Acquired portfolio    
Loans acquired - contractual payments 1,901  
Nonaccretable difference (421)  
Expected cash flows 1,480  
Accretable yield (140)  
Carrying balance at acquisition date 1,340  
Balance at the beginning of period 140  
Acquisition activity   140
Accretion (128)  
Reclassification from nonaccretable difference 96  
Balance at the end of period 108 140
Acquired Non-impaired    
Acquired portfolio    
Balance at the beginning of period 3,973 884
Acquisition activity   4,991
Accretion (1,756) (1,902)
Balance at the end of period 2,217 3,973
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  
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 16 603
Accretion (16) (587)
Balance at the end of period   16
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 69 281
Accretion (69) (212)
Balance at the end of period   69
Acquired Non-impaired | FFNM    
Acquired portfolio    
Loans acquired - contractual payments 187,302  
Expected cash flows 187,302  
Accretable yield (4,498)  
Carrying balance at acquisition date 182,804  
Balance at the beginning of period 3,446  
Acquisition activity   4,498
Accretion (1,493) (1,052)
Balance at the end of period 1,953 3,446
Acquired Non-impaired | Lincoln Community Bank    
Acquired portfolio    
Loans acquired - contractual payments 37,700  
Expected cash flows 37,700  
Accretable yield (493)  
Carrying balance at acquisition date 37,207  
Balance at the beginning of period 442  
Acquisition activity   493
Accretion (178) (51)
Balance at the end of period 264 442
Receivables Acquired with Deteriorated Credit Quality    
Acquired portfolio    
Accretion (404)  
Receivables Acquired with Deteriorated Credit Quality | FFNM    
Acquired portfolio    
Loans acquired - contractual payments $ 5,440  
Receivables Acquired with Deteriorated Credit Quality | Lincoln Community Bank    
Acquired portfolio    
Loans acquired - contractual payments   1,901
Receivables Acquired with Deteriorated Credit Quality | Acquired Impaired    
Acquired portfolio    
Accretion   $ (546)