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Summary of Significant Accounting Policies - Consolidation of Variable Interest Entities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | $ 5,390,977 | $ 4,004,968
Long-term Debt | 19,098,648 | 16,243,697
Farm & Ranch |  |
Variable Interest Entity [Line Items] |  |
Borrower remittances | 15,600 | 11,900
USDA Guarantees |  |
Variable Interest Entity [Line Items] |  |
Unamortized premiums and discounts | 200 | 200
On-Balance Sheet: | Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | 1,600,917 | 1,517,101
Long-term Debt | 1,616,504 | 1,528,957
Off-Balance Sheet: | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 496,538 | 503,546
Farmer Mac Guaranteed Securities: | On-Balance Sheet: | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 32,041 | 27,627
Maximum exposure to loss | 31,887 | 27,383
Debt Securities |  |
Variable Interest Entity [Line Items] |  |
Unamortized premiums and discounts | (1,382) | 3,489
Debt Securities | On-Balance Sheet: | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 1,117,203 | 1,000,942
Maximum exposure to loss | 1,120,765 | 1,003,968
Operating Segments | On-Balance Sheet: | Farm & Ranch | Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | 1,600,917 | 1,517,101
Long-term Debt | 1,616,504 | 1,528,957
Operating Segments | On-Balance Sheet: | USDA Guarantees | Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | 0 | 0
Long-term Debt | 0 | 0
Operating Segments | Off-Balance Sheet: | Farm & Ranch | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 107,322 | 135,862
Operating Segments | Off-Balance Sheet: | USDA Guarantees | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 389,216 | 367,684
Operating Segments | Farmer Mac Guaranteed Securities: | On-Balance Sheet: | Farm & Ranch | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 0 | 0
Maximum exposure to loss | 0 | 0
Operating Segments | Farmer Mac Guaranteed Securities: | On-Balance Sheet: | USDA Guarantees | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 32,041 | 27,627
Maximum exposure to loss | 31,887 | 27,383
Operating Segments | Debt Securities | On-Balance Sheet: | Farm & Ranch | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 0 | 0
Maximum exposure to loss | 0 | 0
Operating Segments | Debt Securities | On-Balance Sheet: | USDA Guarantees | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 0 | 0
Maximum exposure to loss | 0 | 0
Corporate | On-Balance Sheet: | Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | 0 | 0
Long-term Debt | 0 | 0
Corporate | Off-Balance Sheet: | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 0 | 0
Corporate | Farmer Mac Guaranteed Securities: | On-Balance Sheet: | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 0 | 0
Maximum exposure to loss | 0 | 0
Corporate | Debt Securities | On-Balance Sheet: | Unconsolidated VIEs: |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 1,117,203 | 1,000,942
Maximum exposure to loss | $ 1,120,765 | $ 1,003,968

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