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Borrowings - Summary of Mortgage Note Payable and Line of Credit Additional Information (Details) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 13, 2018 USD ($) | Sep. 06, 2018 USD ($) | Jul. 17, 2018 USD ($) | Jul. 12, 2018 USD ($) | Apr. 11, 2018 USD ($) | Oct. 13, 2017 USD ($) | May 31, 2017 USD ($) debt_instrument | Apr. 30, 2018 USD ($) | Feb. 28, 2018 USD ($) | Apr. 30, 2017 USD ($) | Feb. 28, 2017 USD ($) | Sep. 30, 2018 USD ($) property bond debt_instrument | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) property debt_instrument | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Aug. 17, 2018 USD ($) | Jul. 30, 2018 USD ($) | Mar. 13, 2018 USD ($) | Dec. 05, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of bonds |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22,800,000 | $ 4,663,000 |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 | $ 4,000 | 324,000 | $ 190,000 |  |  |  |  |
Rabo AgriFinance, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  | 4.59% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amortization |  |  |  |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 518,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
New MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  | 126,758,000 |  | 126,758,000 |  |  |  |  |  |
Long-term debt, additional amount available |  |  |  |  |  |  |  |  |  |  |  | $ 13,000,000 |  | $ 13,000,000 |  |  |  |  |  |
Minimum annualized rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |
New MetLife Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee (as percent) |  |  |  |  |  |  |  |  |  |  |  | 0.10% |  | 0.10% |  |  |  |  |  |
Unused fee, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |
New MetLife Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee (as percent) |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  | 0.20% |  |  |  |  |  |
Unused fee, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  |  |  |  |  |
Farm Credit Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 85,588,000 |  | $ 85,588,000 |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  |  |  |  |  |  |  |  | 18 |  | 18 |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.71% |  |  |  |  |  |
Farm Credit CFL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 24,103,000 |  | $ 24,103,000 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  | 4.29% |  | 4.29% |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  |  |  |  |  |  |  |  | 7 |  | 7 |  |  |  |  |  |
Other income |  |  |  |  |  |  |  | $ 142,000 |  | $ 124,000 |  |  |  |  |  | $ 0 |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  |  |  |  | 15.10% |  |  |  |  |  | 18.00% |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  |  |  | 0.58% |  |  |  |  |  |  |  |  |  |  |  |
Farm Credit West |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 25,332,000 |  | $ 25,332,000 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  | 4.99% |  |  |  |  |  |  | 4.08% |  | 4.08% |  |  |  |  |  |
Principal Amortization |  |  |  |  | 20 years 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 1,473,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  |  |  |  |  |  |  |  | 5 |  | 5 |  |  |  |  |  |
Other income |  |  |  |  |  |  |  | $ 11,000 | $ 126,000 |  | $ 59,000 |  |  |  |  | 0 |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  |  |  |  | 36.60% | 19.70% |  |  |  |  |  |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |
CF Farm Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 1,270,000 |  | $ 1,270,000 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  | 4.41% |  | 4.41% |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  |  |  | 1.61% |  |  |  |  |  |  |  |  |  |  |  |
Farm Credit FL Note Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 28,042,000 |  | $ 28,042,000 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  | 5.24% |  | 5.24% |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 3 |  |  |  |  |  |
Other income |  |  |  |  |  |  |  | $ 27,000 |  |  |  |  |  |  |  | 0 |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  |  |  |  | 24.60% |  |  |  |  |  |  |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  |  |  | 1.15% |  |  |  |  |  |  |  |  |  |  |  |
Farm Credit FL Note Payable Issued July 12, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  | 5.38% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amortization |  |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | $ 16,850,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Farm Credit FL Note Payable Issued July 17, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  | 5.38% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amortization |  |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 5,560,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
NW Farm Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 5,281,000 |  | $ 5,281,000 |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  | 4.41% |  | 4.41% |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | $ 17,000 |  |  |  |  |  |  | 0 |  |  |  |
Reduced stated interest rate (as percent) |  |  |  |  |  |  |  |  | 22.70% |  |  |  |  |  |  |  |  |  |  |
Reduction in basis points (as percent) |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
SWGA Farm Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 1,560,000 |  | $ 1,560,000 |  |  |  |  |  |
Stated interest rate (as percent) |  | 5.06% |  |  |  |  |  |  |  |  |  | 5.06% |  | 5.06% |  |  |  |  |  |
Principal Amortization |  | 25 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 1,560,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Farmer Mac Bonds Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90,877,000 |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.55% |
Undrawn Commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,342,000 |
Long-term debt, additional amount available |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 | $ 125,000,000
Number of debt instruments | debt_instrument |  |  |  |  |  |  |  |  |  |  |  | 16 |  | 16 |  |  |  |  |  |
Number of debt instruments repaid | bond |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Repayments of bonds |  |  |  |  |  |  |  |  |  |  |  | $ 16,000,000 |  |  |  |  |  |  |  |
Properties pledged as collateral | property |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  |  |  |  |  |
Farmer Mac Bonds Payable, 2018 Issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) | 4.57% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.06% | 4.45% | 4.47% |
Principal Amortization | 96 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt | $ 4,110,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,050,000 | $ 10,356,000 | $ 1,260,000 |
Number of debt instruments | debt_instrument |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 4 |  |  |  |  |  |
Notes payable to bank | New MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 126,658,000 |  | $ 126,658,000 |  |  |  |  |  |
Interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  | 3.30% |  | 3.30% |  |  |  |  |  |
Undrawn Commitment |  |  |  |  |  |  |  |  |  |  |  | $ 63,530,000 |  | $ 63,530,000 |  |  |  |  |  |
Amortizing principal payments |  |  |  |  |  |  |  |  |  |  |  | 9,800,000 |  | 9,800,000 |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  | 200,000,000 |  |  |  |  |  |
Notes payable to bank | Metlife Term Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  | $ 14,765,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Amortization |  |  |  |  |  |  | 28 years 7 months |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank | Metlife Term Loans | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  | 3.55% |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable to bank | Metlife Term Loans | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as percent) |  |  |  |  |  |  | 3.85% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit | New MetLife Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  | 100,000 |  |  |  |  |  |
Undrawn Commitment |  |  |  |  |  |  |  |  |  |  |  | $ 74,900,000 |  | $ 74,900,000 |  |  |  |  |  |
Effective interest rate (as percent) |  |  |  |  |  |  |  |  |  |  |  | 4.59% |  | 4.59% |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |  | $ 75,000,000 |  |  |  |  |  |
Line of credit | New MetLife Facility | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage added to LIBOR (as percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |
Collateral | Farmer Mac Bonds Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on collateral pledged |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |  |  |  |  |

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- Definition Debt instrument commitment fee percentage. + References No definition available. + Details
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- Definition Debt Instruments, Number Of Debt Instruments Repaid In Period + References No definition available. + Details
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- Definition Debt Instruments, Number of Debt Instruments Issued + References No definition available. + Details
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- Definition Line of Credit Facility, Additional Properties Pledged as Collateral + References No definition available. + Details
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- Definition Long Term Debt Additional Available Amount + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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