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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       $ 13,845       $ 12,884 $ 13,845 $ 12,884 $ 11,190
Charge-offs                 (533) (757) (365)
Recoveries                 103 43 134
Provision $ 900 $ 550 $ 550 400 $ 525 $ 400 $ 350 400 2,400 1,675 1,925
Balance at end of period 15,815       13,845       15,815 13,845 12,884
Individually evaluated for impairment 510       735       510 735 676
Collectively evaluated for impairment 15,305       13,110       15,305 13,110 12,208
Real Estate Loans [Member] | Residential [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       1,114       1,105 1,114 1,105 1,049
Charge-offs                 0 (32) (118)
Recoveries                 14 0 69
Provision                 46 41 105
Balance at end of period 1,174       1,114       1,174 1,114 1,105
Individually evaluated for impairment 18       32       18 32 24
Collectively evaluated for impairment 1,156       1,082       1,156 1,082 1,081
Real Estate Loans [Member] | Commercial [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       4,549       4,115 4,549 4,115 3,867
Charge-offs                 (435) (578) (66)
Recoveries                 37 0 3
Provision                 2,065 1,012 311
Balance at end of period 6,216       4,549       6,216 4,549 4,115
Individually evaluated for impairment 95       251       95 251 216
Collectively evaluated for impairment 6,121       4,298       6,121 4,298 3,899
Real Estate Loans [Member] | Agricultural [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       5,022       4,264 5,022 4,264 3,143
Charge-offs                 (4) 0 0
Recoveries                 19 0 0
Provision                 (84) 758 1,121
Balance at end of period 4,953       5,022       4,953 5,022 4,264
Individually evaluated for impairment 83       151       83 151 84
Collectively evaluated for impairment 4,870       4,871       4,870 4,871 4,180
Real Estate Loans [Member] | Construction [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       43       58 43 58 23
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision                 79 (15) 35
Balance at end of period 122       43       122 43 58
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment 122       43       122 43 58
Consumer [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       112       120 112 120 124
Charge-offs                 (50) (49) (40)
Recoveries                 21 33 31
Provision                 238 8 5
Balance at end of period 321       112       321 112 120
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment 321       112       321 112 120
Other Commercial Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       1,255       1,354 1,255 1,354 1,272
Charge-offs                 (44) (38) (91)
Recoveries                 12 10 30
Provision                 3 (71) 143
Balance at end of period 1,226       1,255       1,226 1,255 1,354
Individually evaluated for impairment 170       147       170 147 193
Collectively evaluated for impairment 1,056       1,108       1,056 1,108 1,161
Other Agricultural Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       961       752 961 752 492
Charge-offs                 0 (60) (50)
Recoveries                 0 0 1
Provision                 (97) 269 309
Balance at end of period 864       961       864 961 752
Individually evaluated for impairment 144       154       144 154 159
Collectively evaluated for impairment 720       807       720 807 593
State and Political Subdivision Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       536       762 536 762 816
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision                 (57) (226) (54)
Balance at end of period 479       536       479 536 762
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment 479       536       479 536 762
Unallocated [Member]                      
Financing Receivable, Allowance for Credit Losses [Roll Forward]                      
Balance at beginning of period       $ 253       $ 354 253 354 404
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision                 207 (101) (50)
Balance at end of period 460       253       460 253 354
Individually evaluated for impairment 0       0       0 0 0
Collectively evaluated for impairment $ 460       $ 253       $ 460 $ 253 $ 354