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Loans, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period $ 13,084 $ 11,587 $ 12,884 $ 11,190
Charge-offs (139) (61) (353) (177)
Recoveries 9 90 23 103
Provision 350 325 750 825
Balance at end of period 13,304 11,941 13,304 11,941
Real Estate Loans [Member] | Residential [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,089 1,077 1,105 1,049
Charge-offs 0 (2) 0 (17)
Recoveries 0 69 0 69
Provision (23) (99) (39) (56)
Balance at end of period 1,066 1,045 1,066 1,045
Real Estate Loans [Member] | Commercial [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 4,130 4,006 4,115 3,867
Charge-offs (93) 0 (293) 0
Recoveries 0 3 0 3
Provision 363 (215) 578 (76)
Balance at end of period 4,400 3,794 4,400 3,794
Real Estate Loans [Member] | Agricultural [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 4,392 3,340 4,264 3,143
Charge-offs 0   0 0
Recoveries 0   0  
Provision 140 333 268 530
Balance at end of period 4,532 3,673 4,532 3,673
Real Estate Loans [Member] | Construction [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 32 39 58 23
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision 4 5 (22) 21
Balance at end of period 36 44 36 44
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 124 123 120 124
Charge-offs (8) (6) (22) (19)
Recoveries 7 7 18 17
Provision (5) (9) 2 (7)
Balance at end of period 118 115 118 115
Other Commercial Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,283 1,273 1,354 1,272
Charge-offs (38) (46) (38) (91)
Recoveries 2 11 5 14
Provision 81 28 7 71
Balance at end of period 1,328 1,266 1,328 1,266
Other Agricultural Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 756 532 752 492
Charge-offs 0 (7) 0 (50)
Recoveries 0 0 0 0
Provision (15) 64 (11) 147
Balance at end of period 741 589 741 589
State and Political Subdivision Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 565 789 762 816
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (26) (22) (223) (49)
Balance at end of period 539 767 539 767
Unallocated [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 713 408 354 404
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (169) 240 190 244
Balance at end of period $ 544 $ 648 $ 544 $ 648