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LOANS (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Loans        
Total loans   $ 1,003,377 $ 790,753 $ 811,078
Changes in the allowance for loan losses        
Net charge off activity   88 87  
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 $ 924 149 924  
Accretion   (30) (450)  
Reclassification from nonaccretable difference   23 (32)  
Balance at the end of period   142 506  
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 1,457 821 1,457  
Accretion   (297) (313)  
Balance at the end of period   524 1,144  
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 557 319 557  
Accretion   (108) (114)  
Reclassification from nonaccretable difference     8  
Balance at the end of period   211 435  
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    
Acquisition activity   5,198    
Accretion   (83)    
Balance at the end of period   5,115    
Commercial real estate        
Loans        
Total loans   478,798 397,655 406,742
Commercial, financial, and agricultural        
Loans        
Total loans   185,032 151,588 156,951
Commercial construction        
Loans        
Total loans   20,895 10,145 9,243
One to four family residential real estate        
Loans        
Total loans   284,041 200,771 209,890
Consumer        
Loans        
Total loans   19,202 19,059 17,434
Consumer construction        
Loans        
Total loans   15,409 11,535 $ 10,818
Acquired Impaired        
Acquired portfolio        
Accretion (100) (30)    
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 282 149 282  
Accretion   (30) (100)  
Reclassification from nonaccretable difference   23 (32)  
Balance at the end of period   142 214  
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 236 218 236  
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 52 38 52  
Reclassification from nonaccretable difference     8  
Balance at the end of period   38 44  
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    
Acquisition activity   700    
Balance at the end of period   700    
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   642  
Accretion     (350)  
Balance at the end of period     292  
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 1,221 603 1,221  
Accretion   (297) (313)  
Balance at the end of period   306 908  
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 $ 505 281 505  
Accretion   (108) (114)  
Balance at the end of period   173 $ 391  
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    
Acquisition activity   4,498    
Accretion   (83)    
Balance at the end of period   $ 4,415