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Summary of Significant Accounting Policies - Consolidation of Variable Interest Entities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | $ 5,789,391 | $ 5,390,977
Notes payable | 20,665,020 | 19,098,648
Farm & Ranch |  |
Variable Interest Entity [Line Items] |  |
Borrower remittances | 8,800 | 15,600
USDA Guarantees |  |
Variable Interest Entity [Line Items] |  |
Unamortized premiums and discounts | 100 | (200)
On-Balance Sheet: | Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | 1,540,689 | 1,600,917
Notes payable | 1,549,527 | 1,616,504
Off-Balance Sheet: | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 468,205 | 496,538
Farmer Mac Guaranteed Securities | On-Balance Sheet: | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 33,512 | 32,041
Maximum exposure to loss | 33,440 | 31,887
Debt Securities |  |
Variable Interest Entity [Line Items] |  |
Unamortized premiums and discounts | (4,704) | (1,382)
Debt Securities | On-Balance Sheet: | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 1,291,950 | 1,117,203
Maximum exposure to loss | 1,302,410 | 1,120,765
Corporate | On-Balance Sheet: | Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment, at amortized cost | 0 | 0
Notes payable | 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 | Debt Securities | On-Balance Sheet: | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 1,291,950 | 1,117,203
Maximum exposure to loss | 1,302,410 | 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 | 1,540,689 | 1,600,917
Notes payable | 1,549,527 | 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
Notes payable | 0 | 0
Operating Segments | Off-Balance Sheet: | Farm & Ranch | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 97,302 | 107,322
Operating Segments | Off-Balance Sheet: | USDA Guarantees | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 370,903 | 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 | 33,512 | 32,041
Maximum exposure to loss | 33,440 | 31,887
Operating Segments | Debt 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 | Debt 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

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