FAIR VALUE DISCLOSURES - Quantitative Information (Details) $ in Thousands	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Farmer Mac Guaranteed Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	$ 5,623,384
Floating interest rate | Floating rate auction-rate certificates backed by Government guaranteed student loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	19,353	$ 19,476
Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee Asset	5,297	5,382
Recurring | Farmer Mac Guaranteed Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	5,623,384	5,514,546
Recurring | Floating interest rate | Floating rate auction-rate certificates backed by Government guaranteed student loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	19,353	19,476
Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee Asset	5,297	5,382
Recurring | Level 3 | Farmer Mac Guaranteed Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	5,623,384	5,514,546
Recurring | Level 3 | Floating interest rate | Floating rate auction-rate certificates backed by Government guaranteed student loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	19,353	19,476
Farmer Mac Guaranteed Securities | Farmer Mac Guaranteed Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	8,900	9,000
USDA Securities | Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading	651	818
USDA Securities | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading	651	818
AgVantage | Recurring | Farmer Mac Guaranteed Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	5,614,512	5,505,531
AgVantage | Recurring | Level 3 | Farmer Mac Guaranteed Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	5,614,512	5,505,531
Farmer Mac Guaranteed USDA Securities | Recurring | Farmer Mac Guaranteed Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	8,872	9,015
Farmer Mac Guaranteed USDA Securities | Recurring | Level 3 | Farmer Mac Guaranteed Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Available-for-sale, at fair value	8,872	9,015
USDA Securities | USDA Securities | Recurring
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading	651	818
USDA Securities | USDA Securities | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Trading	$ 651	$ 818
Range of broker quotes | Minimum | Floating rate auction-rate certificates backed by Government guaranteed student loans | Indicative bids | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment securities, measurement input	0.984	0.990
Range of broker quotes | Maximum | Floating rate auction-rate certificates backed by Government guaranteed student loans | Indicative bids | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment securities, measurement input	0.984	0.990
Range of broker quotes | Weighted Average | Floating rate auction-rate certificates backed by Government guaranteed student loans | Indicative bids | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment securities, measurement input	0.984	0.990
Discount rate | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee asset, measurement input	0.080
Discount rate | Farmer Mac Guaranteed USDA Securities | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment securities, measurement input	0.080
Discount rate | Minimum | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee asset, measurement input		0.079
Discount rate | Minimum | AgVantage | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment securities, measurement input	0.047	0.050
Discount rate | Minimum | Farmer Mac Guaranteed USDA Securities | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment securities, measurement input		0.079
Discount rate | Minimum | USDA Securities | USDA Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
USDA securities, measurement input	0.050	0.053
Discount rate | Maximum | AgVantage | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment securities, measurement input	0.051	0.055
Discount rate | Maximum | USDA Securities | USDA Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
USDA securities, measurement input	0.052	0.054
Discount rate | Weighted Average | AgVantage | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment securities, measurement input	0.048	0.051
Discount rate | Weighted Average | USDA Securities | USDA Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
USDA securities, measurement input	0.051	0.053
CPR | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Guarantee asset, measurement input	0.03	0.03
CPR | Farmer Mac Guaranteed USDA Securities | Farmer Mac Guaranteed Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment securities, measurement input	0.03	0.03
CPR | Minimum | USDA Securities | USDA Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
USDA securities, measurement input	0.11	0.12
CPR | Maximum | USDA Securities | USDA Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
USDA securities, measurement input	0.14	0.12
CPR | Weighted Average | USDA Securities | USDA Securities | Discounted cash flow | Recurring | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
USDA securities, measurement input	0.13	0.12