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Farmer Mac Guaranteed Securities and USDA Securities - Farmer Mac Guaranteed Securities and USDA Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Farmer Mac Guaranteed Securities and USDA Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | $ 4,112,824 | $ 4,207,531
Amortized Cost | 4,165,727 | 4,262,792
Unrealized Gains | 7,273 | 2,735
Unrealized Losses | (27,341) | (74,175)
Fair Value | 4,145,659 | 4,191,352
Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | 2,040,413 | 2,096,568
Amortized Cost | 2,040,415 | 2,096,618
Unrealized Gains | 7,272 | 2,735
Unrealized Losses | (5,932) | (11,948)
Fair Value | 2,041,755 | 2,087,405
Available-for-sale: |  |
Amortized Cost | 6,408,128 |
Fair Value | 6,441,624 |
USDA Securities [Member] |  |
Trading: |  |
Fair Value | 9,487 | 9,999
Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities and USDA Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 52,903 | 55,261
Available-for-sale: |  |
Unamortized Premium/(Discount) | 52,903 | 55,261
Trading: |  |
Unamortized Premium/(Discount) | 52,903 | 55,261
Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 2 | 50
Available-for-sale: |  |
Unamortized Premium/(Discount) | 2 | 50
Trading: |  |
Unamortized Premium/(Discount) | 2 | 50
Institutional Credit [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | 2,013,619 | 2,069,185
Amortized Cost | 2,013,384 | 2,068,991
Unrealized Gains | 7,035 | 2,637
Unrealized Losses | (5,932) | (11,948)
Fair Value | 2,014,487 | 2,059,680
Available-for-sale: |  |
Unpaid Principal Balance | 6,408,318 | 6,003,733
Amortized Cost | 6,408,128 | 6,003,529
Unrealized Gains | 67,066 | 22,335
Unrealized Losses | (33,570) | (51,367)
Fair Value | 6,441,624 | 5,974,497
Institutional Credit [Member] | Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (235) | (194)
Available-for-sale: |  |
Unamortized Premium/(Discount) | (235) | (194)
Trading: |  |
Unamortized Premium/(Discount) | (235) | (194)
Institutional Credit [Member] | Available-for-sale Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (190) | (204)
Available-for-sale: |  |
Unamortized Premium/(Discount) | (190) | (204)
Trading: |  |
Unamortized Premium/(Discount) | (190) | (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 | 26,794 | 27,383
Amortized Cost | 27,031 | 27,627
Unrealized Gains | 237 | 98
Unrealized Losses | 0 | 0
Fair Value | 27,268 | 27,725
USDA Guarantees [Member] | USDA Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | 2,072,411 | 2,110,963
Amortized Cost | 2,125,312 | 2,166,174
Unrealized Gains | 1 | 0
Unrealized Losses | (21,409) | (62,227)
Fair Value | 2,103,904 | 2,103,947
Trading: |  |
Unpaid Principal Balance | 9,087 | 9,591
Amortized Cost | 9,736 | 10,292
Unrealized Gains | 22 | 20
Unrealized Losses | (271) | (313)
Fair Value | $ 9,487 | $ 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) | $ 237 | $ 244
Available-for-sale: |  |
Unamortized Premium/(Discount) | 237 | 244
Trading: |  |
Unamortized Premium/(Discount) | 237 | 244
USDA Guarantees [Member] | Held-to-maturity Securities [Member] | USDA Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 52,901 | 55,211
Available-for-sale: |  |
Unamortized Premium/(Discount) | 52,901 | 55,211
Trading: |  |
Unamortized Premium/(Discount) | 52,901 | 55,211
USDA Guarantees [Member] | Trading Securities [Member] | USDA Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 649 | 701
Available-for-sale: |  |
Unamortized Premium/(Discount) | 649 | 701
Trading: |  |
Unamortized Premium/(Discount) | $ 649 | $ 701

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