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CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance | Class C non-voting common stock | Series E Preferred Stock | 5.700% Non-Cumulative Preferred Stock, Series D | Series B Preferred Stock | Preferred Stock | Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Preferred Stock Series E Preferred Stock | Preferred Stock 5.700% Non-Cumulative Preferred Stock, Series D | Preferred Stock Series B Preferred Stock | Common Stock | Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock Class C non-voting common stock | Additional Paid-in Capital | Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-in Capital Class C non-voting common stock | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings Class C non-voting common stock
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Beginning balance ( in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  | 8,400 |  |  |  |  | 10,669 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 752,557 |  |  |  |  |  |  | $ 204,759 |  |  |  |  | $ 10,669 |  |  | $ 118,822 |  |  | $ 24,956 |  | $ 393,351 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 25,170 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,170 |  |  |
Other comprehensive loss, net of tax | (3,702) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,702) |  |  |  |  |
Cash dividends, preferred stock | (3,296) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,296) |  |  |
Cash dividends, common stock | (7,470) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,470) |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |
Issuance of stock |  |  |  | $ 23 |  |  |  |  |  |  |  |  |  |  | $ 20 |  |  | $ 3 |  |  |  |  |  |
Stock-based compensation cost | 724 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 724 |  |  |  |  |  |  |  |
Other stock-based award activity | (708) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (708) |  |  |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  |  | 8,400 |  |  |  |  | 10,689 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | 763,298 |  |  |  |  |  |  | $ 204,759 |  |  |  |  | $ 10,689 |  |  | 118,841 |  |  | 21,254 |  | 407,755 |  |  |
Beginning balance ( in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  | 8,400 |  |  |  |  | 10,669 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 752,557 |  |  |  |  |  |  | $ 204,759 |  |  |  |  | $ 10,669 |  |  | 118,822 |  |  | 24,956 |  | 393,351 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 59,215 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss, net of tax | (37,799) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on retirement of preferred stock | (1,956) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  |  | 9,400 |  |  |  |  | 10,700 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | 773,742 |  |  |  |  |  |  | $ 228,374 |  |  |  |  | $ 10,700 |  |  | 118,942 |  |  | (12,843) |  | 428,569 |  |  |
Beginning balance ( in shares) at Dec. 31, 2018 |  |  |  |  |  |  |  | 8,400 |  |  |  |  | 10,669 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 752,557 |  |  |  |  |  |  | $ 204,759 |  |  |  |  | $ 10,669 |  |  | 118,822 |  |  | 24,956 |  | 393,351 |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  | 9,400 | 9,400 |  |  |  | 10,712 | 10,712 |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | 799,276 | $ (2,099) | $ 797,177 |  |  |  |  | $ 228,374 | $ 228,374 |  |  |  | $ 10,712 | $ 10,712 |  | 119,304 | $ 119,304 |  | (16,161) | $ (16,161) | 457,047 | $ (2,099) | $ 454,948 |
Beginning balance ( in shares) at Mar. 31, 2019 |  |  |  |  |  |  |  | 8,400 |  |  |  |  | 10,689 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 | 763,298 |  |  |  |  |  |  | $ 204,759 |  |  |  |  | $ 10,689 |  |  | 118,841 |  |  | 21,254 |  | 407,755 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 34,045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,045 |  |  |
Other comprehensive loss, net of tax | (34,097) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (34,097) |  |  |  |  |
Cash dividends, preferred stock | (3,785) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,785) |  |  |
Cash dividends, common stock | (7,490) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,490) |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  | 4,000 |  |  |  | 11 |  |  |  |  |  |  |  |  |
Issuance of stock |  |  |  | 14 |  | $ 96,659 |  |  |  |  | $ 96,659 |  |  |  | $ 11 |  |  | 3 |  |  |  |  |  |
Redemption of stock (in shares) |  |  |  |  |  |  |  |  |  |  |  | (3,000) |  |  |  |  |  |  |  |  |  |  |  |
Redemption of stock |  |  |  |  |  |  | $ (73,044) |  |  |  |  | $ (73,044) |  |  |  |  |  |  |  |  |  |  |  |
Loss on retirement of preferred stock | (1,956) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,956) |  |  |
Stock-based compensation cost | 533 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 533 |  |  |  |  |  |  |  |
Other stock-based award activity | (435) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (435) |  |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  |  | 9,400 |  |  |  |  | 10,700 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | 773,742 |  |  |  |  |  |  | $ 228,374 |  |  |  |  | $ 10,700 |  |  | 118,942 |  |  | (12,843) |  | 428,569 |  |  |
Beginning balance ( in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  | 9,400 | 9,400 |  |  |  | 10,712 | 10,712 |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 799,276 | (2,099) | 797,177 |  |  |  |  | $ 228,374 | $ 228,374 |  |  |  | $ 10,712 | $ 10,712 |  | 119,304 | 119,304 |  | (16,161) | (16,161) | 457,047 | (2,099) | 454,948 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 12,830 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,830 |  |  |
Other comprehensive loss, net of tax | (105,276) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (105,276) |  |  |  |  |
Cash dividends, preferred stock | (3,431) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,431) |  |  |
Cash dividends, common stock | (8,571) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,571) |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |  |
Issuance of stock |  |  |  | 34 |  |  |  |  |  |  |  |  |  |  | $ 15 |  |  | 19 |  |  |  |  |  |
Repurchase of Class C Common Stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4) |  |  |  |  |  |  |  |  |
Repurchase of Class C Common Stock |  |  |  | (235) |  |  |  |  |  |  |  |  |  |  | $ (4) |  |  |  |  |  |  |  |  | $ (231)
Stock-based compensation cost | 1,293 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,293 |  |  |  |  |  |  |  |
Other stock-based award activity | (204) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (204) |  |  |  |  |  |  |  |
Ending balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  |  | 9,400 |  |  |  |  | 10,723 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2020 | 693,617 |  |  |  |  |  |  | $ 228,374 |  |  |  |  | $ 10,723 |  |  | 120,412 |  |  | (121,437) |  | 455,545 |  |  |
Beginning balance ( in shares) at Dec. 31, 2019 |  |  |  |  |  |  |  | 9,400 | 9,400 |  |  |  | 10,712 | 10,712 |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 799,276 | $ (2,099) | $ 797,177 |  |  |  |  | $ 228,374 | $ 228,374 |  |  |  | $ 10,712 | $ 10,712 |  | 119,304 | $ 119,304 |  | (16,161) | $ (16,161) | 457,047 | $ (2,099) | $ 454,948 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 48,456 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss, net of tax | (75,336) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on retirement of preferred stock | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  |  | 12,580 |  |  |  |  | 10,733 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | $ 824,116 |  |  |  |  |  |  | $ 305,377 |  |  |  |  | $ 10,733 |  |  | 120,856 |  |  | (91,497) |  | 478,647 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance ( in shares) at Mar. 31, 2020 |  |  |  |  |  |  |  | 9,400 |  |  |  |  | 10,723 |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 | $ 693,617 |  |  |  |  |  |  | $ 228,374 |  |  |  |  | $ 10,723 |  |  | 120,412 |  |  | (121,437) |  | 455,545 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 35,626 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,626 |  |  |
Other comprehensive loss, net of tax | 29,940 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,940 |  |  |  |  |
Cash dividends, preferred stock | (3,939) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,939) |  |  |
Cash dividends, common stock | (8,585) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8,585) |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  | 3,180 |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Issuance of stock |  |  |  | $ 27 | $ 77,003 |  |  |  |  | $ 77,003 |  |  |  |  | $ 10 |  |  | $ 17 |  |  |  |  |  |
Loss on retirement of preferred stock | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation cost | 719 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other stock-based award activity | (292) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (292) |  |  |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  |  | 12,580 |  |  |  |  | 10,733 |  |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | $ 824,116 |  |  |  |  |  |  | $ 305,377 |  |  |  |  | $ 10,733 |  |  | $ 120,856 |  |  | $ (91,497) |  | $ 478,647 |  |  |

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- Definition Write-Off Of Stock Issuance Costs, Preferred Stock + References No definition available. + Details
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Namespace Prefix: | agm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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