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Fair Value Disclosures - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Financial derivatives | $ 16,123 | $ 7,834 |  |
Guarantee and commitment fees receivable | 37,113 | 38,442 |  |
Financial derivatives | 182,371 | 105,087 |  |
Guarantee and commitment obligation | 35,535 | 36,700 | $ 38,683 | $ 38,400
Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 1,033,941 | 604,381 |  |
Loans | 9,167,525 | 7,317,091 |  |
Financial derivatives | 17,468 | 10,519 |  |
Guarantee and commitment fees receivable | 34,115 | 36,732 |  |
Notes payable | 22,130,263 | 19,234,079 |  |
Debt securities of consolidated trusts held by third parties | 1,390,330 | 1,663,177 |  |
Financial derivatives | 29,892 | 27,042 |  |
Guarantee and commitment obligation | 32,537 | 34,990 |  |
Fair Value | Investment securities: |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Marketable securities | 3,899,925 | 3,005,828 |  |
Fair Value | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Marketable securities | 8,148,691 | 8,606,451 |  |
Fair Value | USDA Securities: |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Marketable securities | 2,637,509 | 2,294,671 |  |
Carrying Amount |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 1,033,941 | 604,381 |  |
Loans | 8,535,146 | 6,981,440 |  |
Financial derivatives | 17,468 | 10,519 |  |
Guarantee and commitment fees receivable | 37,113 | 38,442 |  |
Notes payable | 21,848,917 | 19,098,648 |  |
Debt securities of consolidated trusts held by third parties | 1,323,786 | 1,616,504 |  |
Financial derivatives | 29,892 | 27,042 |  |
Guarantee and commitment obligation | 35,535 | 36,700 |  |
Carrying Amount | Investment securities: |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Marketable securities | 3,898,724 | 3,004,875 |  |
Carrying Amount | Farmer Mac Guaranteed Securities |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Marketable securities | 8,123,493 | 8,590,476 |  |
Carrying Amount | USDA Securities: |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Marketable securities | $ 2,480,321 | $ 2,241,073 |  |

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