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Borrowings - Summary of Borrowings by Type (Details) - USD ($) |  |  |  |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2020 | Jun. 25, 2020 | Jun. 24, 2020 | Jun. 08, 2020 | May 14, 2020 | Sep. 30, 2020 | Feb. 20, 2020 | Jan. 10, 2020 | Dec. 31, 2019 | Dec. 05, 2014
MetLife Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 200,000,000.0 |
Principal outstanding |  |  |  |  |  | $ 11,600,000 |  |  |  |
Premier Farm Credit, FLCA |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 4,500,000,000 |  |  |  |  |
Principal amortization term (in years) |  |  |  |  | 24 years 7 months 6 days |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  | 4.00% |  |  |  |  |
Farm Credit West, FLCA |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 8,500,000,000 |  |  |  |  |  |  |  |
Principal amortization term (in years) |  | 25 years |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  | 3.75% |  |  |  |  |  |  |  |
Farm Credit West, FLCA, 3.00% Fixed Rate Through July 31, 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 600,000,000 |  |  |  |  |  |  |
Principal amortization term (in years) |  |  | 24 years 2 months 12 days |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  | 3.00% |  |  |  |  |  |  |
Farm Credit West, FLCA, 3.00% Fixed Rate Through August 31, 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 600,000,000 |  |  |  |  |  |  |
Principal amortization term (in years) |  |  | 24 years 2 months 12 days |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  | 3.00% |  |  |  |  |  |  |
Farm Credit of Virginia |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt | $ 4,481,000,000 |  |  |  |  |  |  |  |  |
Principal amortization term (in years) | 25 years |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) | 3.99% |  |  |  |  |  |  |  |  |
Conterra Note Payable |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 2,100,000,000 |  |  |  |  |  |
Principal amortization term (in years) |  |  |  | 30 years |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  | 3.40% |  |  |  |  |  |
Farmer Mac Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 8,100,000 |  | $ 125,000,000.0
Stated interest rate (as percent) |  |  |  |  |  |  |  | 2.66% |  |
Notes payable to bank | MetLife Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | 75,000,000 | $ 75,000,000.0 |  |  |
Principal outstanding |  |  |  |  |  | 0 |  |  |  |
Undrawn commitment |  |  |  |  |  | 75,000,000 |  |  | $ 21,500,000 |
Additional amount, maximum |  |  |  |  |  | 12,700,000 |  |  |  |
Line of credit | MetLife Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | 75,000,000 |  |  |  |
Principal outstanding |  |  |  |  |  | 11,600,000 |  |  |  |
Undrawn commitment |  |  |  |  |  | 63,400,000 |  |  |  |
Additional amount, maximum |  |  |  |  |  | $ 12,700,000 |  |  |  |
Minimum annualized rate (as percent) |  |  |  |  |  | 2.50% |  |  |  |
Line of credit | MetLife Facility | LIBOR |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Variable rate (as percent) |  |  |  |  |  | 2.00% |  |  |  |
Minimum | Notes payable to bank | MetLife Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Undrawn amounts (as percent) |  |  |  |  |  | 0.10% |  |  |  |
Minimum | Line of credit | MetLife Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Undrawn amounts (as percent) |  |  |  |  |  | 0.10% |  |  |  |
Maximum | Notes payable to bank | MetLife Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Undrawn amounts (as percent) |  |  |  |  |  | 0.20% |  |  |  |
Maximum | Line of credit | MetLife Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Undrawn amounts (as percent) |  |  |  |  |  | 0.20% |  |  |  |

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