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Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 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 | $ 408 | $ 410 |  |
Collectively evaluated for impairment | 11,179 | 10,780 |  |
Total | 11,587 | 11,190 | $ 9,405 | $ 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 | 38 | 56 |  |
Collectively evaluated for impairment | 1,039 | 993 |  |
Total | 1,077 | 1,049 | 1,042 | 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 | 170 | 94 |  |
Collectively evaluated for impairment | 3,836 | 3,773 |  |
Total | 4,006 | 3,867 | 3,665 | 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 | 5 | 3 |  |
Collectively evaluated for impairment | 3,335 | 3,140 |  |
Total | 3,340 | 3,143 | 1,952 | 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 | 39 | 23 |  |
Total | 39 | 23 | 46 | 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 | 124 | 123 | 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 | 184 | 231 |  |
Collectively evaluated for impairment | 1,089 | 1,041 |  |
Total | 1,273 | 1,272 | 1,215 | 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 | 11 | 26 |  |
Collectively evaluated for impairment | 521 | 466 |  |
Total | 532 | 492 | 306 | 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 | 789 | 816 |  |
Total | 789 | 816 | 824 | 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 | 408 | 404 |  |
Total | $ 408 | $ 404 | $ 232 | $ 98

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