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Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
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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 | $ 442 |  | $ 487 |  |  |
Collectively evaluated for impairment | 10,005 |  | 8,399 |  |  |
Total | 10,447 | $ 9,979 | 8,886 | $ 8,194 | $ 7,359 | $ 7,106
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 | 26 |  | 32 |  |  |
Collectively evaluated for impairment | 1,054 |  | 1,032 |  |  |
Total | 1,080 | 1,104 | 1,064 | 1,013 | 990 | 905
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 | 67 |  | 45 |  |  |
Collectively evaluated for impairment | 3,515 |  | 3,544 |  |  |
Total | 3,582 | 3,541 | 3,589 | 3,615 | 3,338 | 3,376
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 | 99 |  | 54 |  |  |
Collectively evaluated for impairment | 2,595 |  | 1,440 |  |  |
Total | 2,694 | 2,452 | 1,494 | 991 | 581 | 409
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 | 31 |  | 47 |  |  |
Total | 31 | 45 | 47 | 34 | 18 | 24
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 | 2 |  | 0 |  |  |
Collectively evaluated for impairment | 135 |  | 122 |  |  |
Total | 137 | 125 | 122 | 109 | 104 | 102
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 | 208 |  | 326 |  |  |
Collectively evaluated for impairment | 904 |  | 1,001 |  |  |
Total | 1,112 | 1,131 | 1,327 | 1,343 | 1,316 | 1,183
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 | 40 |  | 30 |  |  |
Collectively evaluated for impairment | 422 |  | 282 |  |  |
Total | 462 | 431 | 312 | 299 | 248 | 122
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 | 874 |  | 833 |  |  |
Total | 874 | 838 | 833 | 771 | 764 | 593
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 | 475 |  | 98 |  |  |
Total | $ 475 | $ 312 | $ 98 | $ 19 | $ 0 | $ 392

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