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CONSOLIDATED STATEMENTS OF EQUITY Statement - USD ($) $ in Thousands | Total | Common Class C, Non-Voting [Member] | Preferred Stock [Member] | Preferred Stock [Member] Common Class C, Non-Voting [Member] | Common Stock [Member] | Common Stock [Member] Common Class C, Non-Voting [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] Common Class C, Non-Voting [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] Common Class C, Non-Voting [Member] | Retained Earnings [Member] | Retained Earnings [Member] Common Class C, Non-Voting [Member] | Noncontrolling Interest [Member] | Noncontrolling Interest [Member] Common Class C, Non-Voting [Member]
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Beginning Balance (Shares Outstanding) at Dec. 31, 2014 |  |  | 8,400,000 |  | 10,937,000 |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2014 | $ 781,829 |  | $ 204,759 |  | $ 10,937 |  | $ 113,559 |  | $ 15,533 |  | $ 201,013 |  | $ 236,028 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Attributable to Farmer Mac | 68,700 |  | 0 |  | 0 |  | 0 |  | 0 |  | 68,700 |  | 0 |
Less: Net loss/(income) attributable to non-controlling interest | (5,139) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (214) |
Other comprehensive income, net of tax | (26,552) |  | 0 |  | 0 |  | 0 |  | (26,552) |  | 0 |  | 0 |
Preferred stock | (13,182) |  | 0 |  | 0 |  | 0 |  | 0 |  | (13,182) |  | 0 |
Common stock | (7,000) |  | 0 |  | 0 |  | 0 |  | 0 |  | (7,000) |  | 0 |
Stock Issued During Period, Shares, New Issues |  |  |  | 0 |  | 112,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 1,732 |  | $ 0 |  | $ 112 |  | $ 1,620 |  | $ 0 |  | $ 0 |  | $ 0
Repurchase of Class C Common Stock |  |  |  | 0 |  | (362,000) |  |  |  |  |  |  |  |
Repurchase of Class C Common Stock |  | (10,518) |  | $ 0 |  | $ (362) |  | 0 |  | 0 |  | (10,156) |  | 0
Stock-based compensation cost | 3,269 |  | 0 |  | 0 |  | 3,269 |  | 0 |  | 0 |  | 0 |
Other stock-based award activity | (586) |  | 0 |  | 0 |  | (586) |  | 0 |  | 0 |  | 0 |
Redemption of interest in subsidiary | 242 |  | $ 0 |  | $ 0 |  | 0 |  | 0 |  | 0 |  | 242 |
Ending Balance (Shares Outstanding) at Dec. 31, 2015 |  |  | 8,400,000 |  | 10,687,000 |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2015 | 553,720 |  | $ 204,759 |  | $ 10,687 |  | 117,862 |  | (11,019) |  | 231,228 |  | 203 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | (244,000) |  | 0 |  | 0 |  | 0 |  | 0 |  | (8,147) |  | (235,853) |
Attributable to Farmer Mac | 77,334 |  | 0 |  | 0 |  | 0 |  | 0 |  | 77,334 |  | 0 |
Less: Net loss/(income) attributable to non-controlling interest | 34 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (34) |
Other comprehensive income, net of tax | 44,777 |  | 0 |  | 0 |  | 0 |  | 44,777 |  | 0 |  | 0 |
Preferred stock | (13,182) |  | 0 |  | 0 |  | 0 |  | 0 |  | (13,182) |  | 0 |
Common stock | (10,885) |  | 0 |  | 0 |  | 0 |  | 0 |  | (10,885) |  | 0 |
Stock Issued During Period, Shares, New Issues |  |  |  | 0 |  | 159,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | 693 |  | $ 0 |  | $ 159 |  | 534 |  | 0 |  | 0 |  | 0
Repurchase of Class C Common Stock |  |  |  | 0 |  | (307,000) |  |  |  |  |  |  |  |
Repurchase of Class C Common Stock |  | (9,088) |  | $ 0 |  | $ (307) |  | 0 |  | 0 |  | (8,781) |  | 0
Stock-based compensation cost | 3,343 |  | 0 |  | 0 |  | 3,343 |  | 0 |  | 0 |  | 0 |
Other stock-based award activity | (3,084) |  | 0 |  | 0 |  | (3,084) |  | 0 |  | 0 |  | 0 |
Redemption of interest in subsidiary | 53 |  | $ 0 |  | $ 0 |  | 0 |  | 0 |  | 0 |  | 53 |
Ending Balance (Shares Outstanding) at Dec. 31, 2016 |  |  | 8,400,000 |  | 10,539,000 |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2016 | 643,647 |  | $ 204,759 |  | $ 10,539 |  | 118,655 |  | 33,758 |  | 275,714 |  | 222 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Attributable to Farmer Mac | 84,482 |  | 0 |  | 0 |  | 0 |  | 0 |  | 84,482 |  | 0 |
Less: Net loss/(income) attributable to non-controlling interest | 165 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (165) |
Other comprehensive income, net of tax | 8,274 |  | 0 |  | 0 |  | 0 |  | 8,274 |  | 0 |  | 0 |
Reclass of Stranded Tax Effects from AOCI to Retained Earnings | 0 |  | 0 |  | 0 |  | 0 |  | 9,053 |  | (9,053) |  | 0 |
Preferred stock | (13,182) |  | 0 |  | 0 |  | 0 |  | 0 |  | (13,182) |  | 0 |
Common stock | (15,257) |  | 0 |  | 0 |  | 0 |  | 0 |  | (15,257) |  | 0 |
Stock Issued During Period, Shares, New Issues |  |  |  | 0 |  | 80,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 311 |  | $ 0 |  | $ 80 |  | $ 231 |  | $ 0 |  | $ 0 |  | $ 0
Repurchase of Class C Common Stock |  | (668,000) |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation cost | 2,701 |  | 0 |  | 0 |  | 2,701 |  | 0 |  | 0 |  | 0 |
Other stock-based award activity | (2,608) |  | 0 |  | 0 |  | (2,608) |  | 0 |  | 0 |  | 0 |
Redemption of interest in subsidiary | (57) |  | $ 0 |  | $ 0 |  | 0 |  | 0 |  | 0 |  | (57) |
Ending Balance (Shares Outstanding) at Dec. 31, 2017 |  |  | 8,400,000 |  | 10,619,000 |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2017 | $ 708,146 |  | $ 204,759 |  | $ 10,619 |  | $ 118,979 |  | $ 51,085 |  | $ 322,704 |  | $ 0 |

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