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Borrowings - Farmer Mac Facility (Detail) |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 13, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) debt_instrument bond | Dec. 31, 2017 USD ($) | Aug. 17, 2018 USD ($) | Jul. 30, 2018 USD ($) | Mar. 13, 2018 USD ($) | Dec. 05, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of bonds |  |  | $ 23,455,000 | $ 7,906,000 |  |  |  |
Farmer Mac Bonds Payable |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 125,000,000 | $ 125,000,000
Number of debt instruments issued | debt_instrument |  |  | 16 |  |  |  |  |
Number of debt instruments paid | bond |  |  | 3 |  |  |  |  |
Bonds repaid |  |  | $ 16,000,000 |  |  |  |  |
Principal Outstanding |  |  |  |  |  |  | $ 90,877,000 |
Weighted-average interest rate (as percent) |  |  |  |  |  |  | 3.55% |
Undrawn Commitment |  |  |  |  |  |  | $ 16,342,000 |
Debt instrument, loans to value ratios percentage |  |  | 60.00% |  |  |  |  |
Aggregate principal amount of outstanding bonds percentage |  |  | 110.00% |  |  |  |  |
Farmer Mac Bonds Payable Issued in Current Period |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 4,110,000 |  |  |  | $ 7,050,000 | $ 10,356,000 | $ 1,260,000 |
Number of debt instruments issued | debt_instrument |  |  | 4 |  |  |  |  |
Term of debt | 96 years 10 months 24 days |  |  |  |  |  |  |
Interest rate (as percent) | 4.57% |  |  |  | 4.06% | 4.45% | 4.47% |
Collateral pledged | Farmer Mac Bonds Payable |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Gain on collateral pledged |  | $ 1,400,000 |  |  |  |  |  |

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