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Summary of Significant Accounting Policies - Consolidation of Variable Interest Entities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | $ 6,825,061 | $ 5,390,977
Debt securities of consolidated trusts held by third parties | 21,589,285 | 19,098,648
Farm & Ranch |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | 5,857,324 |
Borrower remittances | 16,000 | 15,600
USDA Guarantees |  |
Variable Interest Entity [Line Items] |  |
Unamortized Premium/(Discount) | (100) | (200)
On-Balance Sheet: |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost |  | 5,276,557
On-Balance Sheet: | Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | 1,276,407 | 1,600,917
Debt securities of consolidated trusts held by third parties | 1,292,416 | 1,616,504
On-Balance Sheet: | Farm & Ranch |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost |  | 5,276,557
Off-Balance Sheet: |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost |  | 2,500,393
Off-Balance Sheet: | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 396,449 | 496,538
Farmer Mac Guaranteed Securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 7,511,638 | 7,143,025
Farmer Mac Guaranteed Securities | On-Balance Sheet: | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 36,505 | 32,041
Maximum exposure to loss | 36,414 | 31,887
Investment securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 3,532,190 | 2,959,843
Unamortized Premium/(Discount) | 9,439 | 1,382
Investment securities | On-Balance Sheet: | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 1,835,688 | 1,117,203
Maximum exposure to loss | 1,829,604 | 1,120,765
Operating Segments | On-Balance Sheet: | Farm & Ranch | Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | 1,276,407 | 1,600,917
Debt securities of consolidated trusts held by third parties | 1,292,416 | 1,616,504
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
Debt securities of consolidated trusts held by third parties | 0 | 0
Operating Segments | Off-Balance Sheet: | Farm & Ranch | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 85,767 | 107,322
Operating Segments | Off-Balance Sheet: | USDA Guarantees | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 310,682 | 389,216
Operating Segments | Farmer Mac Guaranteed Securities | On-Balance Sheet: | Farm & Ranch | Variable Interest Entity, Not Primary Beneficiary |  |
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 | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 36,505 | 32,041
Maximum exposure to loss | 36,414 | 31,887
Operating Segments | Investment securities | On-Balance Sheet: | Farm & Ranch | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 0 | 0
Maximum exposure to loss | 0 | 0
Operating Segments | Investment securities | On-Balance Sheet: | USDA Guarantees | Variable Interest Entity, Not Primary Beneficiary |  |
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
Debt securities of consolidated trusts held by third parties | 0 | 0
Corporate | Off-Balance Sheet: | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 0 | 0
Corporate | Farmer Mac Guaranteed Securities | On-Balance Sheet: | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 0 | 0
Maximum exposure to loss | 0 | 0
Corporate | Investment securities | On-Balance Sheet: | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 1,835,688 | 1,117,203
Maximum exposure to loss | $ 1,829,604 | $ 1,120,765

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