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Loans - Allowance for Losses Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans | $ 10,454 | $ 13,832 | $ 10,454 |  |  |
Increase (Decrease) in allowance for loan losses | 3,504 | 7,805 | 3,504 | $ 238 |  |
Current period charge-offs |  | (5,800) |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans |  |  |  |  | $ 2,656 |
Farm & Ranch |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans | 10,454 | 3,745 | 10,454 | 7,017 |  | $ 6,796
Increase (Decrease) in allowance for loan losses |  | 2,959 | 3,504 | 238 |  |
Current period charge-offs |  | (5,759) |  |  |  |
Farm & Ranch | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans | (3,909) |  | (3,909) |  | (3,909) |
Rural Utilities: |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans | 0 | 10,087 | 0 | 0 |  | $ 0
Increase (Decrease) in allowance for loan losses |  | 4,709 | 0 | 0 |  |
Current period charge-offs |  | $ 0 |  |  |  |
Rural Utilities: | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans | $ 5,378 |  | 5,378 |  | $ 5,378 |
Farm & Ranch and Rural Utilities |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Increase (Decrease) in allowance for loan losses |  |  | $ (3,200) | $ (1,400) |  |

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