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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       $ 12,884       $ 11,190 $ 12,884 $ 11,190 $ 8,886
Charge-offs                 (757) (365) (313)
Recoveries                 43 134 77
Provision $ 525 $ 400 $ 350 400 $ 625 $ 475 $ 325 500 1,675 1,925 2,540
Balance at end of period 13,845       12,884       13,845 12,884 11,190
Individually evaluated for impairment 735       676       735 676 410
Collectively evaluated for impairment 13,110       12,208       13,110 12,208 10,780
Real Estate Loans [Member] | Residential [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       1,105       1,049 1,105 1,049 1,064
Charge-offs                 (32) (118) (107)
Recoveries                 0 69 0
Provision                 41 105 92
Balance at end of period 1,114       1,105       1,114 1,105 1,049
Individually evaluated for impairment 32       24       32 24 56
Collectively evaluated for impairment 1,082       1,081       1,082 1,081 993
Real Estate Loans [Member] | Commercial [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       4,115       3,867 4,115 3,867 3,589
Charge-offs                 (578) (66) (41)
Recoveries                 0 3 11
Provision                 1,012 311 308
Balance at end of period 4,549       4,115       4,549 4,115 3,867
Individually evaluated for impairment 251       216       251 216 94
Collectively evaluated for impairment 4,298       3,899       4,298 3,899 3,773
Real Estate Loans [Member] | Agricultural [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       4,264       3,143 4,264 3,143 1,494
Charge-offs                 0 0 (30)
Recoveries                 0 0 0
Provision                 758 1,121 1,679
Balance at end of period 5,022       4,264       5,022 4,264 3,143
Individually evaluated for impairment 151       84       151 84 3
Collectively evaluated for impairment 4,871       4,180       4,871 4,180 3,140
Real Estate Loans [Member] | Construction [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       58       23 58 23 47
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision                 (15) 35 (24)
Balance at end of period 43       58       43 58 23
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment 43       58       43 58 23
Consumer [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       120       124 120 124 122
Charge-offs                 (49) (40) (130)
Recoveries                 33 31 49
Provision                 8 5 83
Balance at end of period 112       120       112 120 124
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment 112       120       112 120 124
Other Commercial Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       1,354       1,272 1,354 1,272 1,327
Charge-offs                 (38) (91) 0
Recoveries                 10 30 16
Provision                 (71) 143 (71)
Balance at end of period 1,255       1,354       1,255 1,354 1,272
Individually evaluated for impairment 147       193       147 193 231
Collectively evaluated for impairment 1,108       1,161       1,108 1,161 1,041
Other Agricultural Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       752       492 752 492 312
Charge-offs                 (60) (50) (5)
Recoveries                 0 1 1
Provision                 269 309 184
Balance at end of period 961       752       961 752 492
Individually evaluated for impairment 154       159       154 159 26
Collectively evaluated for impairment 807       593       807 593 466
State and Political Subdivision Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       762       816 762 816 833
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision                 (226) (54) (17)
Balance at end of period 536       762       536 762 816
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment 536       762       536 762 816
Unallocated [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       $ 354       $ 404 354 404 98
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision                 (101) (50) 306
Balance at end of period 253       354       253 354 404
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment $ 253       $ 354       $ 253 $ 354 $ 404