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Fair Value Disclosures - Quantitative Information (Details) - Recurring - Level 3 $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 6,973,567 | $ 7,170,850 | $ 6,003,211 | $ 5,508,576
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 | 19,171 | 18,912 |  |
USDA Securities: |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 6,695 | 8,913 | $ 9,999 | $ 13,515
AgVantage Securities | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 6,947,701 | $ 7,143,025 |  |
Range of broker quotes | Minimum | Floating rate auction-rate certificates backed by Government guaranteed student loans | Valuation, Market Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.975 | 0.960 |  |
Range of broker quotes | Maximum | Floating rate auction-rate certificates backed by Government guaranteed student loans | Valuation, Market Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.975 | 0.960 |  |
Range of broker quotes | Weighted Average | Floating rate auction-rate certificates backed by Government guaranteed student loans | Valuation, Market Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.975 | 0.960 |  |
Discount rate | Minimum | AgVantage Securities | Farmer Mac Guaranteed Securities | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.008 | 0.023 |  |
Discount rate | Minimum | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.009 | 0.023 |  |
Discount rate | Maximum | AgVantage Securities | Farmer Mac Guaranteed Securities | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.023 | 0.055 |  |
Discount rate | Maximum | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.019 | 0.026 |  |
Discount rate | Weighted Average | AgVantage Securities | Farmer Mac Guaranteed Securities | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.013 | 0.026 |  |
Discount rate | Weighted Average | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.014 | 0.021 |  |
CPR | Minimum | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.25 | 0.10 |  |
CPR | Maximum | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.49 | 0.21 |  |
CPR | Weighted Average | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.44 | 0.19 |  |

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