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Fair Value Disclosures - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial derivatives | $ 2,934 | $ 5,709
Guarantee and commitment fees receivable: | 39,136 | 40,366
Financial derivatives | 136,518 | 27,385
Guarantee and commitment obligation | 37,449 | 38,683
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 587,941 | 425,256
Loans | 6,593,256 | 5,512,781
Financial derivatives | 5,589 | 7,487
Debt securities of consolidated trusts held by third parties | 1,545,314 | 1,501,754
Financial derivatives | 30,542 | 19,633
Fair Value [Member] | Investment Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 3,157,163 | 2,263,446
Fair Value [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 8,651,085 | 8,061,903
Fair Value [Member] | USDA Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,192,017 | 2,113,946
Fair Value [Member] | Long-Term Standby Purchase Commitments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Guarantee and commitment fees receivable: | 32,424 | 37,461
Guarantee and commitment obligation | 31,292 | 36,471
Fair Value [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Guarantee and commitment fees receivable: | 2,647 | 3,424
Guarantee and commitment obligation | 2,091 | 2,731
Fair Value [Member] | Long-term Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 9,086,048 | 8,473,558
Fair Value [Member] | Due within one year [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 9,886,555 | 7,744,388
Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 587,941 | 425,256
Loans | 6,517,220 | 5,515,052
Financial derivatives | 5,589 | 7,487
Debt securities of consolidated trusts held by third parties | 1,532,401 | 1,528,957
Financial derivatives | 30,542 | 19,633
Carrying Amount [Member] | Investment Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 3,156,664 | 2,262,884
Carrying Amount [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 8,635,157 | 8,071,115
Carrying Amount [Member] | USDA Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,173,007 | 2,176,173
Carrying Amount [Member] | Long-Term Standby Purchase Commitments [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Guarantee and commitment fees receivable: | 36,173 | 36,870
Guarantee and commitment obligation | 35,041 | 35,880
Carrying Amount [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Guarantee and commitment fees receivable: | 2,963 | 3,496
Guarantee and commitment obligation | 2,408 | 2,803
Carrying Amount [Member] | Long-term Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 8,940,989 | 8,486,647
Carrying Amount [Member] | Due within one year [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | $ 9,885,633 | $ 7,757,050

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