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Farmer Mac Guaranteed Securities and USDA Securities - Farmer Mac Guaranteed Securities and USDA Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Farmer Mac Guaranteed Securities and USDA Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | $ 3,575,170 | $ 4,207,531
Amortized Cost | 3,616,680 | 4,262,792
Unrealized Gains | 36,928 | 2,735
Unrealized Losses | (1,990) | (74,175)
Fair Value | 3,651,618 | 4,191,352
Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | 1,452,665 | 2,096,568
Amortized Cost | 1,452,616 | 2,096,618
Unrealized Gains | 16,645 | 2,735
Unrealized Losses | (717) | (11,948)
Fair Value | 1,468,544 | 2,087,405
Available-for-sale: |  |
Amortized Cost | 7,008,885 |
Fair Value | 7,182,541 |
USDA Securities [Member] |  |
Trading: |  |
Fair Value | 8,943 | 9,999
Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities and USDA Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 41,510 | 55,261
Available-for-sale: |  |
Unamortized Premium/(Discount) | 41,510 | 55,261
Trading: |  |
Unamortized Premium/(Discount) | 41,510 | 55,261
Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (49) | 50
Available-for-sale: |  |
Unamortized Premium/(Discount) | (49) | 50
Trading: |  |
Unamortized Premium/(Discount) | (49) | 50
Institutional Credit [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | 1,420,020 | 2,069,185
Amortized Cost | 1,419,800 | 2,068,991
Unrealized Gains | 16,019 | 2,637
Unrealized Losses | (660) | (11,948)
Fair Value | 1,435,159 | 2,059,680
Available-for-sale: |  |
Unpaid Principal Balance | 7,009,022 | 6,003,733
Amortized Cost | 7,008,885 | 6,003,529
Unrealized Gains | 211,878 | 22,335
Unrealized Losses | (38,222) | (51,367)
Fair Value | 7,182,541 | 5,974,497
Institutional Credit [Member] | Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (220) | (194)
Available-for-sale: |  |
Unamortized Premium/(Discount) | (220) | (194)
Trading: |  |
Unamortized Premium/(Discount) | (220) | (194)
Institutional Credit [Member] | Available-for-sale Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (137) | (204)
Available-for-sale: |  |
Unamortized Premium/(Discount) | (137) | (204)
Trading: |  |
Unamortized Premium/(Discount) | (137) | (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 | 32,645 | 27,383
Amortized Cost | 32,816 | 27,627
Unrealized Gains | 626 | 98
Unrealized Losses | (57) | 0
Fair Value | 33,385 | 27,725
USDA Guarantees [Member] | USDA Securities [Member] |  |
Held-to-maturity: |  |
Unpaid Principal Balance | 2,122,505 | 2,110,963
Amortized Cost | 2,164,064 | 2,166,174
Unrealized Gains | 20,283 | 0
Unrealized Losses | (1,273) | (62,227)
Fair Value | 2,183,074 | 2,103,947
Trading: |  |
Unpaid Principal Balance | 8,561 | 9,591
Amortized Cost | 9,082 | 10,292
Unrealized Gains | 14 | 20
Unrealized Losses | (153) | (313)
Fair Value | $ 8,943 | $ 9,999
Trading securities, weighted-average yield | 5.21% | 5.21%
USDA Guarantees [Member] | Held-to-maturity Securities [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | $ 171 | $ 244
Available-for-sale: |  |
Unamortized Premium/(Discount) | 171 | 244
Trading: |  |
Unamortized Premium/(Discount) | 171 | 244
USDA Guarantees [Member] | Held-to-maturity Securities [Member] | USDA Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 41,559 | 55,211
Available-for-sale: |  |
Unamortized Premium/(Discount) | 41,559 | 55,211
Trading: |  |
Unamortized Premium/(Discount) | 41,559 | 55,211
USDA Guarantees [Member] | Trading Securities [Member] | USDA Securities [Member] |  |
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 521 | 701
Available-for-sale: |  |
Unamortized Premium/(Discount) | 521 | 701
Trading: |  |
Unamortized Premium/(Discount) | $ 521 | $ 701

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