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Related Party Transactions - Schedule of Related Party Transactions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Mortgages | Rural Utilities |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases: | $ 776,400 |  |
Zions Bancorporation, National Association | Sale of Farmer Mac Guaranteed Securities |  |  |
Related Party Transaction [Line Items] |  |  |
Sales of Farmer Mac Guaranteed Securities | 163,134 | $ 68,721 | $ 128,924
Zions Bancorporation, National Association | USDA Guarantee | USDA Securities: |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases: | 8,875 | 19,120 | 20,368
Zions Bancorporation, National Association | Mortgages | Farm & Ranch |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases: | 129,040 | 114,719 | 126,449
CFC |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases: | 660,000 | 986,645 | 487,341
CFC | Rural Utilities | Guarantee Obligations |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases: | 575,000 | 675,000 | 350,000
CFC | Institutional Credit | US Government-sponsored Enterprises Debt Securities | Off-Balance Sheet: |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases: | 0 | 300,000 | 0
CFC | Real Estate Loan | Rural Utilities |  |  |
Related Party Transaction [Line Items] |  |  |
Purchases: | $ 85,000 | $ 11,645 | $ 137,341

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