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LOANS, Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Allowance for credit losses [Roll Forward]      
Beginning balance $ 11,133 $ 10,899 $ 10,899
Provision for (reversal of) loan losses 525 600 600
Charge-offs (6) (11) (835)
Recoveries 63 11 469
Net charge-offs 57 0 (366)
Ending balance 11,715 11,499 11,133
Period-end amount allocated to [Abstract]      
Loans individually evaluated for impairment 467 2,079 470
Loans collectively evaluated for impairment 11,248 9,420 10,663
Ending balance 11,715 11,499 11,133
Loans individually and collectively evaluated for impairment [Abstract]      
Loans individually evaluated for impairment 8,496 10,766 9,001
Loans collectively evaluated for impairment 722,739 653,157 740,195
Ending balance 731,235 663,923 749,196
Commercial [Member]      
Allowance for credit losses [Roll Forward]      
Beginning balance 2,625 3,571 3,571
Provision for (reversal of) loan losses (85) 235 (567)
Charge-offs 0 0 (681)
Recoveries 9 2 302
Net charge-offs 9 2 (379)
Ending balance 2,549 3,808 2,625
Period-end amount allocated to [Abstract]      
Loans individually evaluated for impairment 47 1,341 53
Loans collectively evaluated for impairment 2,502 2,467 2,572
Ending balance 2,549 3,808 2,625
Loans individually and collectively evaluated for impairment [Abstract]      
Loans individually evaluated for impairment 3,191 5,544 3,660
Loans collectively evaluated for impairment 127,558 115,509 131,355
Ending balance 130,749 121,053 135,015
Commercial Real Estate [Member]      
Allowance for credit losses [Roll Forward]      
Beginning balance 5,460 3,910 3,910
Provision for (reversal of) loan losses (46) 813 1,550
Charge-offs 0 0 0
Recoveries 0 0 0
Net charge-offs 0 0 0
Ending balance 5,414 4,723 5,460
Period-end amount allocated to [Abstract]      
Loans individually evaluated for impairment 36 38 36
Loans collectively evaluated for impairment 5,378 4,685 5,424
Ending balance 5,414 4,723 5,460
Loans individually and collectively evaluated for impairment [Abstract]      
Loans individually evaluated for impairment 1,946 795 1,996
Loans collectively evaluated for impairment 391,964 341,385 396,350
Ending balance 393,910 342,180 398,346
Agriculture [Member]      
Allowance for credit losses [Roll Forward]      
Beginning balance 1,547 1,262 1,262
Provision for (reversal of) loan losses (124) 25 285
Charge-offs 0 0 0
Recoveries 0 0 0
Net charge-offs 0 0 0
Ending balance 1,423 1,287 1,547
Period-end amount allocated to [Abstract]      
Loans individually evaluated for impairment 0 0 0
Loans collectively evaluated for impairment 1,423 1,287 1,547
Ending balance 1,423 1,287 1,547
Loans individually and collectively evaluated for impairment [Abstract]      
Loans individually evaluated for impairment 0 0 0
Loans collectively evaluated for impairment 104,104 94,652 113,555
Ending balance 104,104 94,652 113,555
Residential Mortgage [Member]      
Allowance for credit losses [Roll Forward]      
Beginning balance 628 660 660
Provision for (reversal of) loan losses (1) 41 (7)
Charge-offs 0 0 (121)
Recoveries 16 0 96
Net charge-offs 16 0 (25)
Ending balance 643 701 628
Period-end amount allocated to [Abstract]      
Loans individually evaluated for impairment 309 578 302
Loans collectively evaluated for impairment 334 123 326
Ending balance 643 701 628
Loans individually and collectively evaluated for impairment [Abstract]      
Loans individually evaluated for impairment 2,192 3,022 2,277
Loans collectively evaluated for impairment 42,596 40,154 39,804
Ending balance 44,788 43,176 42,081
Residential Construction [Member]      
Allowance for credit losses [Roll Forward]      
Beginning balance 360 440 440
Provision for (reversal of) loan losses (13) 13 (85)
Charge-offs 0 0 0
Recoveries 1 1 5
Net charge-offs 1 1 5
Ending balance 348 454 360
Period-end amount allocated to [Abstract]      
Loans individually evaluated for impairment 71 98 76
Loans collectively evaluated for impairment 277 356 284
Ending balance 348 454 360
Loans individually and collectively evaluated for impairment [Abstract]      
Loans individually evaluated for impairment 644 812 650
Loans collectively evaluated for impairment 20,110 21,926 20,649
Ending balance 20,754 22,738 21,299
Consumer [Member]      
Allowance for credit losses [Roll Forward]      
Beginning balance 342 498 498
Provision for (reversal of) loan losses (68) (114) (189)
Charge-offs (6) (11) (33)
Recoveries 37 8 66
Net charge-offs 31 (3) 33
Ending balance 305 381 342
Period-end amount allocated to [Abstract]      
Loans individually evaluated for impairment 4 24 3
Loans collectively evaluated for impairment 301 357 339
Ending balance 305 381 342
Loans individually and collectively evaluated for impairment [Abstract]      
Loans individually evaluated for impairment 523 593 418
Loans collectively evaluated for impairment 36,407 39,531 38,482
Ending balance 36,930 40,124 38,900
Unallocated [Member]      
Allowance for credit losses [Roll Forward]      
Beginning balance 171 558 558
Provision for (reversal of) loan losses 862 (413) (387)
Charge-offs 0 0 0
Recoveries 0 0 0
Net charge-offs 0 0 0
Ending balance 1,033 145 171
Period-end amount allocated to [Abstract]      
Loans individually evaluated for impairment 0 0 0
Loans collectively evaluated for impairment 1,033 145 171
Ending balance $ 1,033 $ 145 $ 171