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Fair Value Disclosures - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial derivatives | $ 3,135 | $ 5,709
Guarantee and commitment fees receivable: | 38,809 | 40,366
Financial derivatives | 73,401 | 27,385
Guarantee and commitment obligation | 37,246 | 38,683
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 396,602 | 425,256
Loans | 6,403,950 | 5,512,781
Financial derivatives | 7,560 | 7,487
Debt securities of consolidated trusts held by third parties | 1,583,839 | 1,501,754
Financial derivatives | 27,429 | 19,633
Fair Value [Member] | Investment Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,968,265 | 2,263,446
Fair Value [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 8,627,877 | 8,061,903
Fair Value [Member] | USDA Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,141,866 | 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: | 33,678 | 37,461
Guarantee and commitment obligation | 32,549 | 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: | 2,721 | 3,424
Guarantee and commitment obligation | 2,287 | 2,731
Fair Value [Member] | Long-term Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 8,360,759 | 8,473,558
Fair Value [Member] | Due within one year [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 9,937,380 | 7,744,388
Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 396,602 | 425,256
Loans | 6,316,005 | 5,515,052
Financial derivatives | 7,560 | 7,487
Debt securities of consolidated trusts held by third parties | 1,570,862 | 1,528,957
Financial derivatives | 27,429 | 19,633
Carrying Amount [Member] | Investment Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,967,536 | 2,262,884
Carrying Amount [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 8,614,843 | 8,071,115
Carrying Amount [Member] | USDA Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,137,579 | 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: | 35,835 | 36,870
Guarantee and commitment obligation | 34,706 | 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: | 2,974 | 3,496
Guarantee and commitment obligation | 2,540 | 2,803
Carrying Amount [Member] | Long-term Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 8,247,829 | 8,486,647
Carrying Amount [Member] | Due within one year [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | $ 9,939,589 | $ 7,757,050

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