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Fair Value Disclosures - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial derivatives | $ 2,020 | $ 23,182
Guarantee and commitment fees receivable: | 36,679 | 38,871
Derivative Liability | 5,516 | 32,509
Guarantee and commitment obligation | 35,316 | 37,282
Reported Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 366,764 | 265,229
Loans | 5,127,770 | 4,507,435
Financial derivatives | 2,020 | 23,182
Debt securities of consolidated trusts held by third parties | 1,333,417 | 1,142,704
Derivative Liability | 30,595 | 58,152
Reported Value Measurement [Member] | Investment Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,234,966 | 2,515,851
Reported Value Measurement [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 7,602,556 | 6,002,916
Reported Value Measurement [Member] | USDA Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,107,149 | 2,029,613
Reported Value Measurement [Member] | Long-Term Standby Purchase Commitments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Guarantee and commitment fees receivable: | 32,307 | 32,656
Guarantee and commitment obligation | 31,491 | 31,796
Reported Value Measurement [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Guarantee and commitment fees receivable: | 4,372 | 6,215
Guarantee and commitment obligation | 3,825 | 5,486
Reported Value Measurement [Member] | Due within one year [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 8,112,928 | 8,440,123
Reported Value Measurement [Member] | Long-term Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 7,399,961 | 5,222,977
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 366,764 | 265,229
Loans | 5,140,669 | 4,481,019
Financial derivatives | 2,020 | 23,182
Debt securities of consolidated trusts held by third parties | 1,310,240 | 1,107,513
Derivative Liability | 30,595 | 58,152
Estimate of Fair Value Measurement [Member] | Investment Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,234,966 | 2,515,851
Estimate of Fair Value Measurement [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 7,601,376 | 6,006,694
Estimate of Fair Value Measurement [Member] | USDA Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,042,408 | 1,934,023
Estimate of Fair Value Measurement [Member] | Long-Term Standby Purchase Commitments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Guarantee and commitment fees receivable: | 31,986 | 34,720
Guarantee and commitment obligation | 31,169 | 33,860
Estimate of Fair Value Measurement [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Guarantee and commitment fees receivable: | 4,611 | 6,197
Guarantee and commitment obligation | 4,065 | 5,467
Estimate of Fair Value Measurement [Member] | Due within one year [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 8,108,390 | 8,439,515
Estimate of Fair Value Measurement [Member] | Long-term Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | $ 7,450,462 | $ 5,260,497

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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