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Farmer Mac Guaranteed Securities and USDA Guaranteed Securities - Unrealized Loss Position (Details) $ in Thousands | Jun. 30, 2017 USD ($) position | Dec. 31, 2016 USD ($) position
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Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 1,053,697 | $ 1,308,744
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 439,078 | 564,801
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,245) | (1,844)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (2,754) | $ (7,633)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | position | 87 | 97
Farmer Mac Guaranteed Securities and USDA Securities [Member] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 3,387,536 | $ 2,205,516
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 91,364 | 97,270
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (72,757) | (98,996)
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (47) | (8)
Institutional Credit [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,447,267 | 358,575
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (5,968) | (3,175)
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,787,931 | 982,538
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 966,689 | 1,131,930
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (21,001) | (18,482)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ (24,982) | $ (45,452)
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | position | 25 | 22
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year | position | 7 | 10
Held-to-maturity Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | position | 14 | 7
USDA Guarantees [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 30,869 | $ 30,575
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
USDA Guarantees [Member] | USDA Securities [Member] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 1,909,400 | 1,816,366
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 91,364 | 97,270
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (47) | (8)
Available-for-sale Securities [Member] | USDA Guarantees [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (483) | (239)
Available-for-sale Securities [Member] | USDA Guarantees [Member] | USDA Securities [Member] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $ (66,306) | $ (95,582)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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