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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       $ 11,190       $ 8,886 $ 11,190 $ 8,886 $ 7,106
Charge-offs                 (365) (313) (340)
Recoveries                 134 77 600
Provision $ 625 $ 475 $ 325 500 $ 800 $ 500 $ 625 615 1,925 2,540 1,520
Balance at end of period 12,884       11,190       12,884 11,190 8,886
Individually evaluated for impairment 676       410       676 410 487
Collectively evaluated for impairment 12,208       10,780       12,208 10,780 8,399
Real Estate Loans [Member] | Residential [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       1,049       1,064 1,049 1,064 905
Charge-offs                 (118) (107) (85)
Recoveries                 69 0 0
Provision                 105 92 244
Balance at end of period 1,105       1,049       1,105 1,049 1,064
Individually evaluated for impairment 24       56       24 56 32
Collectively evaluated for impairment 1,081       993       1,081 993 1,032
Real Estate Loans [Member] | Commercial [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       3,867       3,589 3,867 3,589 3,376
Charge-offs                 (66) (41) (100)
Recoveries                 3 11 479
Provision                 311 308 (166)
Balance at end of period 4,115       3,867       4,115 3,867 3,589
Individually evaluated for impairment 216       94       216 94 45
Collectively evaluated for impairment 3,899       3,773       3,899 3,773 3,544
Real Estate Loans [Member] | Agricultural [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       3,143       1,494 3,143 1,494 409
Charge-offs                 0 (30) 0
Recoveries                 0 0 0
Provision                 1,121 1,679 1,085
Balance at end of period 4,264       3,143       4,264 3,143 1,494
Individually evaluated for impairment 84       3       84 3 54
Collectively evaluated for impairment 4,180       3,140       4,180 3,140 1,440
Real Estate Loans [Member] | Construction [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       23       47 23 47 24
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision                 35 (24) 23
Balance at end of period 58       23       58 23 47
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment 58       23       58 23 47
Consumer [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       124       122 124 122 102
Charge-offs                 (40) (130) (100)
Recoveries                 31 49 88
Provision                 5 83 32
Balance at end of period 120       124       120 124 122
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment 120       124       120 124 122
Other Commercial Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       1,272       1,327 1,272 1,327 1,183
Charge-offs                 (91) 0 (55)
Recoveries                 30 16 33
Provision                 143 (71) 166
Balance at end of period 1,354       1,272       1,354 1,272 1,327
Individually evaluated for impairment 193       231       193 231 326
Collectively evaluated for impairment 1,161       1,041       1,161 1,041 1,001
Other Agricultural Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       492       312 492 312 122
Charge-offs                 (50) (5) 0
Recoveries                 1 1 0
Provision                 309 184 190
Balance at end of period 752       492       752 492 312
Individually evaluated for impairment 159       26       159 26 30
Collectively evaluated for impairment 593       466       593 466 282
State and Political Subdivision Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       816       833 816 833 593
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision                 (54) (17) 240
Balance at end of period 762       816       762 816 833
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment 762       816       762 816 833
Unallocated [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       $ 404       $ 98 404 98 392
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision                 (50) 306 (294)
Balance at end of period 354       404       354 404 98
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment $ 354       $ 404       $ 354 $ 404 $ 98