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Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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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 | $ 213 |  | $ 510 |  |  |
Collectively evaluated for impairment | 17,121 |  | 15,305 |  |  |
Total | 17,334 | $ 16,931 | 15,815 | $ 15,169 | $ 14,827 | $ 13,845
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 | 14 |  | 18 |  |  |
Collectively evaluated for impairment | 1,176 |  | 1,156 |  |  |
Total | 1,190 | 1,174 | 1,174 | 1,219 | 1,206 | 1,114
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 | 85 |  | 95 |  |  |
Collectively evaluated for impairment | 7,593 |  | 6,121 |  |  |
Total | 7,678 | 7,106 | 6,216 | 5,306 | 4,944 | 4,549
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 | 17 |  | 83 |  |  |
Collectively evaluated for impairment | 4,729 |  | 4,870 |  |  |
Total | 4,746 | 4,706 | 4,953 | 4,806 | 5,061 | 5,022
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 | 538 |  | 122 |  |  |
Total | 538 | 496 | 122 | 85 | 81 | 43
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 | 318 |  | 321 |  |  |
Total | 318 | 85 | 321 | 352 | 362 | 112
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 | 34 |  | 170 |  |  |
Collectively evaluated for impairment | 1,097 |  | 1,056 |  |  |
Total | 1,131 | 1,328 | 1,226 | 1,230 | 1,201 | 1,255
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 | 63 |  | 144 |  |  |
Collectively evaluated for impairment | 385 |  | 720 |  |  |
Total | 448 | 583 | 864 | 735 | 821 | 961
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 | 296 |  | 479 |  |  |
Total | 296 | 404 | 479 | 514 | 547 | 536
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 | 989 |  | 460 |  |  |
Total | $ 989 | $ 1,049 | $ 460 | $ 922 | $ 604 | $ 253

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