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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%