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Borrowings - Summary of Borrowings by Type (Details) - USD ($) |  |  |  |  | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 11, 2021 | Mar. 03, 2021 | Feb. 04, 2021 | Jan. 28, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 10, 2020 | Feb. 20, 2020 | Dec. 31, 2019 | Dec. 05, 2014
MetLife Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate amount |  |  |  |  |  |  |  |  | $ 200,000,000.0 |
Principal outstanding |  |  |  |  | $ 37,000,000 |  |  |  |  |
Farmer Mac Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate amount |  |  | $ 2,460,000 |  |  |  | $ 225,000,000.0 |  |  | $ 125,000,000.0
Stated interest rate (as percent) |  |  | 3.13% |  |  |  |  |  |  |
Principal amortization term (in years) |  |  | 25 years |  |  |  |  |  |  |
Farm Credit West, FLCA |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate amount |  |  |  | $ 2,073,000 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  | 3.23% |  | 4.99% |  |  |  |
Principal amortization term (in years) |  |  |  | 24 years 9 months 18 days |  |  |  |  |  |
Notes Payable |  |  |  |  |  | $ 1,400,000 |  |  |  |
Mid Atlantic Farm Credit, ACA |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate amount |  | $ 960,000 |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  | 3.80% |  |  |  |  |  |  |  |
Principal amortization term (in years) |  | 24 years 4 months 24 days |  |  |  |  |  |  |  |
Rabo AgriFinance, LLC, 2.11% Through December 1, 2030 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate amount | $ 3,780,000 |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) | 3.27% |  |  |  |  |  |  |  |  |
Principal amortization term (in years) | 25 years |  |  |  |  |  |  |  |  |
Rabo AgriFinance, LLC, 2.11% Through December 1, 2022 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate amount | $ 630,000 |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) | 2.44% |  |  |  |  |  |  |  |  |
Notes payable to bank | MetLife Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate amount |  |  |  |  | 75,000,000 |  |  | $ 75,000,000.0 |  |
Principal outstanding |  |  |  |  | $ 36,900,000 |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  | 2.75% |  |  |  |  |
Undrawn commitment |  |  |  |  | $ 38,100,000 |  |  |  | $ 21,500,000 |
Additional amount, maximum |  |  |  |  | 24,200,000 |  |  |  |  |
Line of credit | MetLife Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate amount |  |  |  |  | 75,000,000 |  |  |  |  |
Principal outstanding |  |  |  |  | 100,000 |  |  |  |  |
Undrawn commitment |  |  |  |  | 74,900,000 |  |  |  |  |
Additional amount, maximum |  |  |  |  | $ 24,200,000 |  |  |  |  |
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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