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Fair Value Disclosures - Quantitative Information (Details) - Fair Value, Measurements, Recurring - Fair Value, Inputs, Level 3 $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 7,170,850 | $ 6,003,211 | $ 5,508,576 | $ 4,891,803
USDA Securities: |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 8,913 | 9,999 | 13,515 | 20,388
Available-for-Sale Securities | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 7,143,025 | 5,974,497 | 5,471,914 | 4,853,685
Available-for-Sale Securities | USDA Securities: |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 0 | 0 | 0 | 0
Available-for-Sale Securities | Institutional Credit | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 7,143,025 | 5,974,497 | 5,471,914 | 4,853,685
Trading Securities | USDA Securities: |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 8,913 | $ 9,999 | $ 13,515 | $ 20,388
Measurement Input, Discount Rate | Minimum | Institutional Credit | Farmer Mac Guaranteed Securities | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.023 | 0.030 |  |
Measurement Input, Discount Rate | Minimum | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.023 | 0.032 |  |
Measurement Input, Discount Rate | Maximum | Institutional Credit | Farmer Mac Guaranteed Securities | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.055 | 0.044 |  |
Measurement Input, Discount Rate | Maximum | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.026 | 0.052 |  |
Measurement Input, Discount Rate | Weighted Average | Institutional Credit | Farmer Mac Guaranteed Securities | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Investment securities, measurement input | 0.026 | 0.033 |  |
Measurement Input, Discount Rate | Weighted Average | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.021 | 0.049 |  |
Measurement Input, Constant Prepayment Rate | Minimum | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.10 | 0.07 |  |
Measurement Input, Constant Prepayment Rate | Maximum | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.21 | 0.17 |  |
Measurement Input, Constant Prepayment Rate | Weighted Average | USDA Guarantees | USDA Securities: | Valuation, Cost Approach |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
USDA securities, measurement input | 0.19 | 0.16 |  |
Measurement Input, 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 | 0.960 | 0.950 |  |
Measurement Input, 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 | 0.960 | 0.950 |  |
Measurement Input, 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 | 0.960 | 0.950 |  |

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