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Related Party Transactions - National Rural Utilities Cooperative Financial Corporation (Details) - CFC [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | $ 986,645 | $ 487,341 | $ 741,895
Related Party Transaction, Related Party's percent of total Program | 19.10% | 10.30% | 16.70%
Related Party's percent of Farmer Mac Total Outstanding Book of Business | 23.60% | 24.60% |
Related Party Transaction, Other Revenues from Transactions with Related Party | $ 57 | $ 65 | $ 74
Due from Related Parties | 9,400 | 5,200 |
Interest Income, Related Party | 76,800 | 43,900 | 27,600
Accounts Receivable, Related Parties, Current | 100 |  |
Revenue from Related Parties | 1,900 | 2,200 | 2,000
Related Party Transaction, Expenses from Transactions with Related Party | $ 3,600 | $ 3,500 | $ 3,300
Rural Utilities [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Related Party's percent of total Program | 100.00% |  |
Institutional Credit [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Related Party's percent of total Program | 29.50% | 14.70% | 11.90%
Real Estate Loan [Member] | Rural Utilities [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | $ 11,645 | $ 137,341 | $ 50,491
Guarantee Obligations [Member] | Rural Utilities [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 675,000 | 350,000 | 250,000
Farmer Mac Guaranteed Securities [Member] | Off-balance sheet [Member] | Institutional Credit [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | 300,000 | 0 | 0
Revolving Credit Facility [Member] | Off-balance sheet [Member] | Institutional Credit [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Purchases from Related Party | $ 0 | $ 0 | $ 441,404
Common Class A [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Common Stock Ownership Percentage by a Related Party | 7.90% |  |

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