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Loans, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period $ 11,587 $ 9,405 $ 11,190 $ 8,886
Charge-offs (61) (65) (177) (184)
Recoveries 90 14 103 37
Provision 325 625 825 1,240
Balance at end of period 11,941 9,979 11,941 9,979
Real Estate Loans [Member] | Residential [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,077 1,042 1,049 1,064
Charge-offs (2) (48) (17) (93)
Recoveries 69 0 69 0
Provision (99) 110 (56) 133
Balance at end of period 1,045 1,104 1,045 1,104
Real Estate Loans [Member] | Commercial [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 4,006 3,665 3,867 3,589
Charge-offs 0 0 0 (41)
Recoveries 3 2 3 6
Provision (215) (126) (76) (13)
Balance at end of period 3,794 3,541 3,794 3,541
Real Estate Loans [Member] | Agricultural [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 3,340 1,952 3,143 1,494
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision 333 500 530 958
Balance at end of period 3,673 2,452 3,673 2,452
Real Estate Loans [Member] | Construction [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 39 46 23 47
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision 5 (1) 21 (2)
Balance at end of period 44 45 44 45
Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 123 123 124 122
Charge-offs (6) (17) (19) (45)
Recoveries 7 12 17 22
Provision (9) 7 (7) 26
Balance at end of period 115 125 115 125
Other Commercial Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,273 1,215 1,272 1,327
Charge-offs (46) 0 (91) 0
Recoveries 11 0 14 9
Provision 28 (84) 71 (205)
Balance at end of period 1,266 1,131 1,266 1,131
Other Agricultural Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 532 306 492 312
Charge-offs (7) 0 (50) (5)
Recoveries 0 0 0 0
Provision 64 125 147 124
Balance at end of period 589 431 589 431
State and Political Subdivision Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 789 824 816 833
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision (22) 14 (49) 5
Balance at end of period 767 838 767 838
Unallocated [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 408 232 404 98
Charge-offs 0 0 0 0
Recoveries 0 0 0 0
Provision 240 80 244 214
Balance at end of period $ 648 $ 312 $ 648 $ 312