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Fair Value Disclosures - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial derivatives | $ 5,142 | $ 7,093
Guarantee and commitment fees receivable: | 39,997 | 39,895
Derivative Liability | 2,683 | 1,673
Guarantee and commitment obligation | 38,487 | 38,400
Reported Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 493,258 | 302,022
Loans | 5,302,197 | 5,266,786
Financial derivatives | 5,142 | 7,093
Debt securities of consolidated trusts held by third parties | 1,463,653 | 1,404,945
Derivative Liability | 22,570 | 26,599
Reported Value Measurement [Member] | Investment Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,238,384 | 2,260,437
Reported Value Measurement [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 8,021,430 | 7,598,188
Reported Value Measurement [Member] | USDA Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,139,327 | 2,131,365
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: | 36,035 | 35,718
Guarantee and commitment obligation | 35,099 | 34,824
Reported Value Measurement [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Guarantee and commitment fees receivable: | 3,962 | 4,177
Guarantee and commitment obligation | 3,388 | 3,576
Reported Value Measurement [Member] | Due within one year [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 7,896,359 | 8,089,826
Reported Value Measurement [Member] | Long-term Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 8,127,594 | 7,432,790
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 493,258 | 302,022
Loans | 5,341,228 | 5,279,225
Financial derivatives | 5,142 | 7,093
Debt securities of consolidated trusts held by third parties | 1,431,475 | 1,386,652
Derivative Liability | 22,570 | 26,599
Estimate of Fair Value Measurement [Member] | Investment Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,239,715 | 2,260,969
Estimate of Fair Value Measurement [Member] | Farmer Mac Guaranteed Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 8,006,115 | 7,588,806
Estimate of Fair Value Measurement [Member] | USDA Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Marketable Securities | 2,087,775 | 2,076,396
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: | 36,558 | 33,871
Guarantee and commitment obligation | 35,623 | 32,976
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: | 4,058 | 4,323
Guarantee and commitment obligation | 3,485 | 3,722
Estimate of Fair Value Measurement [Member] | Due within one year [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | 7,885,414 | 8,079,309
Estimate of Fair Value Measurement [Member] | Long-term Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes payable: | $ 8,095,285 | $ 7,445,545

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