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Fair Value Disclosures - Quantitative Information (Details) - Fair Value, Measurements, Recurring - Level 3 $ in Thousands | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 7,612,315 | $ 7,170,850 | $ 6,470,023 | $ 6,003,211
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 | 16,721 | 18,912 |  |
USDA Securities: |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 8,408 | 8,913 |  |
Institutional Credit | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | 7,587,186 | 7,143,025 |  |
USDA Guarantees | USDA Securities: |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Fair Value | $ 8,408 | $ 8,913 | $ 9,487 | $ 9,999
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 | 0.850 | 0.960 |  |
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 | 0.850 | 0.960 |  |
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 | 0.850 | 0.960 |  |
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 | 0.011 | 0.023 |  |
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 | 0.016 | 0.023 |  |
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 | 0.022 | 0.055 |  |
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 | 0.022 | 0.026 |  |
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 | 0.014 | 0.026 |  |
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 | 0.016 | 0.021 |  |
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 | 0.13 | 0.10 |  |
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 | 0.23 | 0.21 |  |
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 | 0.21 | 0.19 |  |

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