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Investments - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
SERP investments | $ 801,000 |  | $ 801,000 |  | $ 801,000
SERP investments at fair value | 1,812,000 |  | 1,812,000 |  | 2,317,000
CoBank |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
SERP investments at fair value | 10,000,000 |  | 10,000,000 |  | $ 10,300,000
Other nonoperating income (expense) | $ 100,000 | $ 1,000,000 | $ 200,000 | $ 2,000,000 |
Percentage of patronage credit paid in cash | 75.00% |  | 75.00% |  |
Percentage of patronage credit paid in share | 25.00% |  | 25.00% |  |
Valley Network Partnership |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest, percentage | 20.00% |  | 20.00% |  | 20.00%
Equity Method Investee |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Revenue from related parties | $ 200,000 |  | $ 400,000 |  |
Related party costs | $ 26,200 | $ 600,000 | $ 54,400 | $ 1,100,000 |

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