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Fair Value Disclosures - Quantitative Information (Details) $ in Thousands | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 6,600,246 |  |  |
Recurring | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 6,600,246 | $ 6,328,559 |  |
Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 6,628,731 | 6,358,451 | $ 6,787,933 | $ 6,973,567
Guarantee Asset | 6,138 | 6,237 |  |
Recurring | Level 3 | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 6,600,246 | 6,328,559 |  |
Floating rate auction-rate certificates backed by Government guaranteed student loans | Recurring | Level 3 | Floating Interest Rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 18,961 | 19,254 |  |
Farmer Mac Guaranteed Securities | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 11,000 | 12,400 |  |
USDA Securities: | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 3,386 | 4,401 | $ 5,578 | $ 6,695
AgVantage Securities | Recurring | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 6,589,224 | 6,316,145 |  |
AgVantage Securities | Recurring | Level 3 | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 6,589,224 | 6,316,145 |  |
AgVantage Securities | Farmer Mac Guaranteed Securities | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 6,589,224 | 6,316,145 |  |
Farmer Mac Guaranteed USDA Securities | Recurring | Level 3 | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 11,022 | $ 12,414 |  |
Range of broker quotes | Minimum | Floating rate auction-rate certificates backed by Government guaranteed student loans | Indicative bids | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.965 | 0.980 |  |
Range of broker quotes | Maximum | Floating rate auction-rate certificates backed by Government guaranteed student loans | Indicative bids | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.965 | 0.980 |  |
Range of broker quotes | Weighted Average | Floating rate auction-rate certificates backed by Government guaranteed student loans | Indicative bids | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.965 | 0.980 |  |
Discount rate | Minimum | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Guarantee asset, measurement input | 0.039 | 0.054 |  |
Discount rate | Minimum | AgVantage Securities | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.017 | 0.009 |  |
Discount rate | Minimum | Farmer Mac Guaranteed USDA Securities | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.034 | 0.023 |  |
Discount rate | Minimum | USDA Securities | USDA Securities: | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.031 | 0.014 |  |
Discount rate | Maximum | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Guarantee asset, measurement input | 0.044 | 0.058 |  |
Discount rate | Maximum | AgVantage Securities | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.032 | 0.021 |  |
Discount rate | Maximum | Farmer Mac Guaranteed USDA Securities | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.039 | 0.028 |  |
Discount rate | Maximum | USDA Securities | USDA Securities: | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.047 | 0.031 |  |
Discount rate | Weighted Average | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Guarantee asset, measurement input | 0.042 | 0.056 |  |
Discount rate | Weighted Average | AgVantage Securities | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.029 | 0.017 |  |
Discount rate | Weighted Average | Farmer Mac Guaranteed USDA Securities | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.036 | 0.026 |  |
Discount rate | Weighted Average | USDA Securities | USDA Securities: | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.044 | 0.028 |  |
CPR | Farmer Mac Guaranteed USDA Securities | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.08 | 0.080 |  |
CPR | Minimum | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Guarantee asset, measurement input | 0.08 | 0.07 |  |
CPR | Minimum | USDA Securities | USDA Securities: | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.21 | 0.25 |  |
CPR | Maximum | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Guarantee asset, measurement input |  | 0.12 |  |
CPR | Maximum | USDA Securities | USDA Securities: | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.33 | 0.42 |  |
CPR | Weighted Average | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Guarantee asset, measurement input |  | 0.08 |  |
CPR | Weighted Average | USDA Securities | USDA Securities: | Discounted cash flow | Recurring | Level 3 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.31 | 0.39 |  |

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