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Farmer Mac Guaranteed Securities and USDA Guaranteed Securities - Schedule of Held-to-maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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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 | $ 4,205,710 | $ 4,244,124
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract] |  |
Held-to-maturity Securities, Fair Value | $ 4,108,772 | 4,179,772
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 | 3.30% |
Held-to-Maturity Securities, Debt Maturities, After Ten Years, Weighted-Average Yield | 3.50% |
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 | $ 769,783 |
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount | 1,368,924 |
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount | 212,947 |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | 2,093,092 | 2,126,274
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value [Abstract] |  |
Held-to-maturity Securities, Debt Maturities, Next Twelve Months, Fair Value | 766,311 |
Held-to-maturity Securities, Debt Maturities, Year Two Through Five, Fair Value | 1,351,656 |
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value | 205,159 |
Held-to-maturity Securities, Fair Value | $ 2,074,587 | $ 2,116,891
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 | 2.10% |
Held-to-Maturity Securities, Debt Maturities, Year Two Through Five, Weighted-Average Yield | 2.77% |
Held-to-Maturity Securities, Debt Maturities, Weighted-Average Yield | 2.99% |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount | $ 1,854,056 |
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value | $ 1,785,646 |

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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=82897076&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=75019621&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=75019621&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=82897076&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=82897076&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=75019621&loc=d3e62586-112803 + Details
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