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Farmer Mac Guaranteed Securities and USDA Guaranteed Securities - Schedule of Held-to-maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Farmer Mac Guaranteed Securities and USDA Securities [Member] |  |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | $ 4,203,812 | $ 3,158,456
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract] |  |
Held-to-maturity Securities, Fair Value | $ 4,137,000 | 3,066,644
Held-to-Maturity Securities, Debt Maturities, Weighted Average Yield, Single Maturity Date [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Weighted Average Yield | 3.04% |
Held-to-Maturity Securities, Debt Maturities, After Ten Years, Weighted-Average Yield | 3.32% |
Farmer Mac Guaranteed Securities [Member] |  |
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount | $ 855,465 |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount | 1,316,883 |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | 188,751 |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | 2,137,786 | 1,149,231
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value | 855,175 |
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value | 1,315,234 |
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value | 182,992 |
Held-to-maturity Securities, Fair Value | $ 2,137,327 | $ 1,153,009
Held-to-Maturity Securities, Debt Maturities, Weighted Average Yield, Single Maturity Date [Abstract] |  |
Held-to-Maturity Securities, Debt Maturities, Next Twelve Months, Weighted-Average Yield | 1.80% |
Held-to-Maturity Securities, Debt Maturities, Year Two Through Five, Weighted-Average Yield | 2.16% |
Held-to-Maturity Securities, Debt Maturities, Weighted-Average Yield | 2.62% |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount | $ 1,842,713 |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value | $ 1,783,599 |

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- Definition Fair value of held-to-maturity debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(3) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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- Definition Fair value of held-to-maturity debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Fair value of held-to-maturity debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(4) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 + Details
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