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Equity - Quarterly Dividends Paid by Farmer Mac (Details) - $ / shares | 3 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Series A |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) | $ 0 | $ 0.2530 | $ 0.3672 | $ 0.3672 | $ 0.3672 | $ 0.3672 | $ 0.3672 | $ 0.3672 | $ 0.3672 | $ 0.3672 | $ 0.3672 | $ 0.3672
Series C |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) | 0.3750 | 0.3750 | 0.3750 | 0.3750 | 0.3750 | 0.3750 | 0.3750 | 0.3750 | 0.3750 | 0.3750 | 0.3750 | 0.3750
Series D |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) | 0.3563 | 0.3563 | 0.3563 | 0.3563 | 0.3563 | 0.3563 | 0.2533 | 0 |  |  |  |
Series D | May 13, 2019 to July 17, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) |  |  |  |  |  |  | 0.2533 |  |  |  |  |
Series E |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) | 0.3594 | 0.3594 | 0.2276 | 0 |  |  |  |  |  |  |  |
Series E | May 20, 2020 to July 17, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) |  |  | 0.2276 |  |  |  |  |  |  |  |  |
Series E | July 17, 2020 to September 19, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) |  | 0.2530 |  |  |  |  |  |  |  |  |  |
Series F |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) | $ 0.3281 | 0.2078 | $ 0 | $ 0 |  |  |  |  |  |  |  |
Series F | August 20, 2020 to October 17, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) |  | $ 0.2078 |  |  |  |  |  |  |  |  |  |
Series B |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) |  |  |  |  | $ 0 | $ 0 | 0.2626 | $ 0.4297 | $ 0.4297 | $ 0.4297 | $ 0.4297 | $ 0.4297
Series B | April 17, 2019 to June 12, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends (in dollars per share) |  |  |  |  |  |  | $ 0.2626 |  |  |  |  |

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