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Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | $ 654 |  | $ 410 |  |  |
Collectively evaluated for impairment | 11,729 |  | 10,780 |  |  |
Total | 12,383 | $ 11,941 | 11,190 | $ 10,447 | $ 9,979 | $ 8,886
Real Estate Loans [Member] | Residential [Member] |  |  |  |  |  |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 27 |  | 56 |  |  |
Collectively evaluated for impairment | 1,025 |  | 993 |  |  |
Total | 1,052 | 1,045 | 1,049 | 1,080 | 1,104 | 1,064
Real Estate Loans [Member] | Commercial [Member] |  |  |  |  |  |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 224 |  | 94 |  |  |
Collectively evaluated for impairment | 3,701 |  | 3,773 |  |  |
Total | 3,925 | 3,794 | 3,867 | 3,582 | 3,541 | 3,589
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |  |  |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 86 |  | 3 |  |  |
Collectively evaluated for impairment | 3,843 |  | 3,140 |  |  |
Total | 3,929 | 3,673 | 3,143 | 2,694 | 2,452 | 1,494
Real Estate Loans [Member] | Construction [Member] |  |  |  |  |  |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 49 |  | 23 |  |  |
Total | 49 | 44 | 23 | 31 | 45 | 47
Consumer [Member] |  |  |  |  |  |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 123 |  | 124 |  |  |
Total | 123 | 115 | 124 | 137 | 125 | 122
Other Commercial Loans [Member] |  |  |  |  |  |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 152 |  | 231 |  |  |
Collectively evaluated for impairment | 1,067 |  | 1,041 |  |  |
Total | 1,219 | 1,266 | 1,272 | 1,112 | 1,131 | 1,327
Other Agricultural Loans [Member] |  |  |  |  |  |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 165 |  | 26 |  |  |
Collectively evaluated for impairment | 534 |  | 466 |  |  |
Total | 699 | 589 | 492 | 462 | 431 | 312
State and Political Subdivision Loans [Member] |  |  |  |  |  |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 751 |  | 816 |  |  |
Total | 751 | 767 | 816 | 874 | 838 | 833
Unallocated [Member] |  |  |  |  |  |
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract] |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 636 |  | 404 |  |  |
Total | $ 636 | $ 648 | $ 404 | $ 475 | $ 312 | $ 98

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