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Farmer Mac Guaranteed Securities and USDA Securities - Farmer Mac Guaranteed Securities and USDA Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Farmer Mac Guaranteed Securities and USDA Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | $ 3,659,496 | $ 4,207,531
Amortized Cost | 3,707,553 | 4,262,792
Unrealized Gains | 20,838 | 2,735
Unrealized Losses | (3,517) | (74,175)
Fair Value | 3,724,874 | 4,191,352
Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | 1,579,212 | 2,096,568
Amortized Cost | 1,579,175 | 2,096,618
Unrealized Gains | 14,627 | 2,735
Unrealized Losses | (1,593) | (11,948)
Fair Value | 1,592,209 | 2,087,405
Available-for-sale: |  |
Amortized Cost | 6,923,315 |
Fair Value | 7,035,668 |
USDA Securities [Member] |  |
Trading: |  |
Fair Value | 9,201 | 9,999
Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities and USDA Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 48,057 | 55,261
Available-for-sale: |  |
Unamortized Premium/(Discount) | 48,057 | 55,261
Trading: |  |
Unamortized Premium/(Discount) | 48,057 | 55,261
Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (37) | 50
Available-for-sale: |  |
Unamortized Premium/(Discount) | (37) | 50
Trading: |  |
Unamortized Premium/(Discount) | (37) | 50
Institutional Credit [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | 1,545,629 | 2,069,185
Amortized Cost | 1,545,397 | 2,068,991
Unrealized Gains | 14,003 | 2,637
Unrealized Losses | (1,593) | (11,948)
Fair Value | 1,557,807 | 2,059,680
Available-for-sale: |  |
Unpaid Principal Balance | 6,923,464 | 6,003,733
Amortized Cost | 6,923,315 | 6,003,529
Unrealized Gains | 143,685 | 22,335
Unrealized Losses | (31,332) | (51,367)
Fair Value | 7,035,668 | 5,974,497
Institutional Credit [Member] | Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (232) | (194)
Available-for-sale: |  |
Unamortized Premium/(Discount) | (232) | (194)
Trading: |  |
Unamortized Premium/(Discount) | (232) | (194)
Institutional Credit [Member] | Available-for-sale Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (149) | (204)
Available-for-sale: |  |
Unamortized Premium/(Discount) | (149) | (204)
Trading: |  |
Unamortized Premium/(Discount) | (149) | (204)
USDA Guarantees [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (200) | (200)
Available-for-sale: |  |
Unamortized Premium/(Discount) | (200) | (200)
Trading: |  |
Unamortized Premium/(Discount) | (200) | (200)
USDA Guarantees [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | 33,583 | 27,383
Amortized Cost | 33,778 | 27,627
Unrealized Gains | 624 | 98
Unrealized Losses | 0 | 0
Fair Value | 34,402 | 27,725
USDA Guarantees [Member] | USDA Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | 2,080,284 | 2,110,963
Amortized Cost | 2,128,378 | 2,166,174
Unrealized Gains | 6,211 | 0
Unrealized Losses | (1,924) | (62,227)
Fair Value | 2,132,665 | 2,103,947
Trading: |  |
Unpaid Principal Balance | 8,818 | 9,591
Amortized Cost | 9,388 | 10,292
Unrealized Gains | 15 | 20
Unrealized Losses | (202) | (313)
Fair Value | $ 9,201 | $ 9,999
Trading securities, weighted-average yield | 5.23% | 5.21%
USDA Guarantees [Member] | Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | $ 195 | $ 244
Available-for-sale: |  |
Unamortized Premium/(Discount) | 195 | 244
Trading: |  |
Unamortized Premium/(Discount) | 195 | 244
USDA Guarantees [Member] | Held-to-maturity Securities [Member] | USDA Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 48,094 | 55,211
Available-for-sale: |  |
Unamortized Premium/(Discount) | 48,094 | 55,211
Trading: |  |
Unamortized Premium/(Discount) | 48,094 | 55,211
USDA Guarantees [Member] | Trading Securities [Member] | USDA Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 570 | 701
Available-for-sale: |  |
Unamortized Premium/(Discount) | 570 | 701
Trading: |  |
Unamortized Premium/(Discount) | $ 570 | $ 701

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