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Fair Value Disclosures - Quantitative Information (Details) - Recurring - Level 3 $ in Thousands | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Fair Value | $ 6,163,052 | $ 6,901,703 | $ 6,973,567 | $ 7,537,540 | $ 7,924,456 | $ 7,170,850
Floating rate auction-rate certificates backed by Government guaranteed student loans | Floating Interest Rate |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Fair Value | 19,500 |  | 19,171 |  |  |
USDA Securities: |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Fair Value | 4,793 | $ 5,050 | 6,695 | $ 6,830 | $ 7,786 | $ 8,913
AgVantage Securities | Farmer Mac Guaranteed Securities |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Fair Value | $ 6,138,759 |  | $ 6,947,701 |  |  |
Range of broker quotes | Minimum | Floating rate auction-rate certificates backed by Government guaranteed student loans | Indicative bids |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Investment securities, measurement input | 0.993 |  | 0.975 |  |  |
Range of broker quotes | Maximum | Floating rate auction-rate certificates backed by Government guaranteed student loans | Indicative bids |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Investment securities, measurement input | 0.993 |  | 0.975 |  |  |
Range of broker quotes | Weighted Average | Floating rate auction-rate certificates backed by Government guaranteed student loans | Indicative bids |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Investment securities, measurement input | 0.993 |  | 0.975 |  |  |
Discount rate | Minimum | AgVantage Securities | Farmer Mac Guaranteed Securities | Discounted cash flow |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Investment securities, measurement input | 0.009 |  | 0.008 |  |  |
Discount rate | Minimum | USDA Guarantees | USDA Securities: | Discounted cash flow |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
USDA securities, measurement input | 0.014 |  | 0.009 |  |  |
Discount rate | Maximum | AgVantage Securities | Farmer Mac Guaranteed Securities | Discounted cash flow |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Investment securities, measurement input | 0.021 |  | 0.023 |  |  |
Discount rate | Maximum | USDA Guarantees | USDA Securities: | Discounted cash flow |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
USDA securities, measurement input | 0.023 |  | 0.019 |  |  |
Discount rate | Weighted Average | AgVantage Securities | Farmer Mac Guaranteed Securities | Discounted cash flow |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
Investment securities, measurement input | 0.014 |  | 0.013 |  |  |
Discount rate | Weighted Average | USDA Guarantees | USDA Securities: | Discounted cash flow |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
USDA securities, measurement input | 0.018 |  | 0.014 |  |  |
CPR | Minimum | USDA Guarantees | USDA Securities: | Discounted cash flow |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
USDA securities, measurement input | 0.25 |  | 0.25 |  |  |
CPR | Maximum | USDA Guarantees | USDA Securities: | Discounted cash flow |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
USDA securities, measurement input | 0.43 |  | 0.49 |  |  |
CPR | Weighted Average | USDA Guarantees | USDA Securities: | Discounted cash flow |  |  |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |  |  |
USDA securities, measurement input | 0.34 |  | 0.44 |  |  |

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