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Loans - Allowance for Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for losses | $ 14,856 |  | $ 10,454
Farm & Ranch |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for losses | 7,353 |  | 10,454
Farm & Ranch | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for losses |  | $ (3,909) |
Rural Utilities |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for losses | $ 7,503 |  | $ 0
Rural Utilities | Cumulative Effect, Period of Adoption, Adjustment |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for losses |  | $ 5,378 |

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