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Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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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 | $ 810 |  | $ 676 |  |  |
Collectively evaluated for impairment | 12,869 |  | 12,208 |  |  |
Total | 13,679 | $ 13,304 | 12,884 | $ 12,383 | $ 11,941 | $ 11,190
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 | 22 |  | 24 |  |  |
Collectively evaluated for impairment | 1,069 |  | 1,081 |  |  |
Total | 1,091 | 1,066 | 1,105 | 1,052 | 1,045 | 1,049
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 | 342 |  | 216 |  |  |
Collectively evaluated for impairment | 4,299 |  | 3,899 |  |  |
Total | 4,641 | 4,400 | 4,115 | 3,925 | 3,794 | 3,867
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 | 145 |  | 84 |  |  |
Collectively evaluated for impairment | 4,567 |  | 4,180 |  |  |
Total | 4,712 | 4,532 | 4,264 | 3,929 | 3,673 | 3,143
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 | 19 |  | 58 |  |  |
Total | 19 | 36 | 58 | 49 | 44 | 23
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 | 119 |  | 120 |  |  |
Total | 119 | 118 | 120 | 123 | 115 | 124
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 | 144 |  | 193 |  |  |
Collectively evaluated for impairment | 1,205 |  | 1,161 |  |  |
Total | 1,349 | 1,328 | 1,354 | 1,219 | 1,266 | 1,272
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 | 157 |  | 159 |  |  |
Collectively evaluated for impairment | 712 |  | 593 |  |  |
Total | 869 | 741 | 752 | 699 | 589 | 492
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 | 536 |  | 762 |  |  |
Total | 536 | 539 | 762 | 751 | 767 | 816
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 | 343 |  | 354 |  |  |
Total | $ 343 | $ 544 | $ 354 | $ 636 | $ 648 | $ 404

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