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Loans, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period $ 14,247 $ 13,084 $ 13,845 $ 12,884
Charge-offs (10) (139) (19) (353)
Recoveries 40 9 51 23
Provision (Credit) 550 350 950 750
Balance at end of period 14,827 13,304 14,827 13,304
Real Estate Loans [Member] | Residential [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,154 1,089 1,114 1,105
Charge-offs   0   0
Recoveries   0   0
Provision (Credit) 52 (23) 92 (39)
Balance at end of period 1,206 1,066 1,206 1,066
Real Estate Loans [Member] | Commercial [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 4,729 4,130 4,549 4,115
Charge-offs 0 (93) (1) (293)
Recoveries 33 0 34 0
Provision (Credit) 182 363 362 578
Balance at end of period 4,944 4,400 4,944 4,400
Real Estate Loans [Member] | Agricultural [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 4,878 4,392 5,022 4,264
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) 183 140 39 268
Balance at end of period 5,061 4,532 5,061 4,532
Real Estate Loans [Member] | Construction [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 56 32 43 58
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) 25 4 38 (22)
Balance at end of period 81 36 81 36
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 117 124 112 120
Charge-offs (10) (8) (18) (22)
Recoveries 4 7 12 18
Provision (Credit) 251 (5) 256 2
Balance at end of period 362 118 362 118
Other Commercial Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,297 1,283 1,255 1,354
Charge-offs 0 (38) 0 (38)
Recoveries 3 2 5 5
Provision (Credit) (99) 81 (59) 7
Balance at end of period 1,201 1,328 1,201 1,328
Other Agricultural Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 835 756 961 752
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) (14) (15) (140) (11)
Balance at end of period 821 741 821 741
State and Political Subdivision Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 558 565 536 762
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) (11) (26) 11 (223)
Balance at end of period 547 539 547 539
Unallocated [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 623 713 253 354
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Credit) (19) (169) 351 190
Balance at end of period $ 604 $ 544 $ 604 $ 544