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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Consolidation of Variable Interest Entities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | $ 11,636,815 | $ 11,183,408
Debt securities of consolidated trusts held by third parties | 28,049,766 | 27,520,173
Farmer Mac Guaranteed Securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 5,623,384 | 5,514,546
Investment securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 6,230,080 | 5,953,014
Agricultural Finance |  |
Variable Interest Entity [Line Items] |  |
Borrower remittances | 200 | 4,700
Unamortized discount | 110,500 | 113,200
Consolidated VIE | On-balance sheet |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 2,005,680 | 2,038,283
Debt securities of consolidated trusts held by third parties | 1,894,920 | 1,929,628
Consolidated VIE | On-balance sheet | Agricultural Finance |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost |  | 2,038,283
Debt securities of consolidated trusts held by third parties |  | 1,929,628
Consolidated VIE | On-balance sheet | Treasury |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost |  | 0
Debt securities of consolidated trusts held by third parties |  | 0
Consolidated VIE | Operating Segments | On-balance sheet | Agricultural Finance |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 2,005,680 |
Debt securities of consolidated trusts held by third parties | 1,894,920 |
Consolidated VIE | Corporate, non-segment | On-balance sheet |  |
Variable Interest Entity [Line Items] |  |
Loans held for investment in consolidated trusts, at amortized cost | 0 |
Debt securities of consolidated trusts held by third parties | 0 |
Unconsolidated VIE | On-balance sheet | Farmer Mac Guaranteed Securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 58,580 | 59,317
Maximum exposure to loss | 58,219 | 58,985
Unconsolidated VIE | On-balance sheet | Investment securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 4,476,698 | 4,212,258
Maximum exposure to loss | 4,730,044 | 4,547,397
Unconsolidated VIE | On-balance sheet | Agricultural Finance | Farmer Mac Guaranteed Securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value |  | 59,317
Maximum exposure to loss |  | 58,985
Unconsolidated VIE | On-balance sheet | Agricultural Finance | Investment securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value |  | 0
Maximum exposure to loss |  | 0
Unconsolidated VIE | On-balance sheet | Treasury | Farmer Mac Guaranteed Securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value |  | 0
Maximum exposure to loss |  | 0
Unconsolidated VIE | On-balance sheet | Treasury | Investment securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value |  | 4,212,258
Maximum exposure to loss |  | 4,547,397
Unconsolidated VIE | Off-balance sheet |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 414,291 | 426,310
Unconsolidated VIE | Off-balance sheet | Agricultural Finance |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss |  | 426,310
Unconsolidated VIE | Off-balance sheet | Treasury |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss |  | $ 0
Unconsolidated VIE | Operating Segments | On-balance sheet | Agricultural Finance | Farmer Mac Guaranteed Securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 58,580 |
Maximum exposure to loss | 58,219 |
Unconsolidated VIE | Operating Segments | On-balance sheet | Agricultural Finance | Investment securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 0 |
Maximum exposure to loss | 0 |
Unconsolidated VIE | Operating Segments | Off-balance sheet | Agricultural Finance |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | 414,291 |
Unconsolidated VIE | Corporate, non-segment | On-balance sheet | Farmer Mac Guaranteed Securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 0 |
Maximum exposure to loss | 0 |
Unconsolidated VIE | Corporate, non-segment | On-balance sheet | Investment securities |  |
Variable Interest Entity [Line Items] |  |
Carrying value | 4,476,698 |
Maximum exposure to loss | 4,730,044 |
Unconsolidated VIE | Corporate, non-segment | Off-balance sheet |  |
Variable Interest Entity [Line Items] |  |
Maximum exposure to loss | $ 0 |

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