FARMER MAC GUARANTEED SECURITIES AND USDA SECURITIES - Narrative (Details) - AgVantage $ in Millions	Jul. 01, 2023 USD ($)	Mar. 31, 2024 security	Dec. 31, 2023 security
Debt Securities, Available-for-sale [Line Items]
Held-to-maturity, transfer in | $	$ 2,700.0
Held-to-maturity, transfer in, unrealized loss | $	31.9
Held-to-maturity, transfer in, accumulated unrealized loss | $	$ 31.9
Farmer Mac Guaranteed Securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale, securities in unrealized loss positions		73	68
Held-to-maturity, securities in unrealized loss positions		63	53
Unrealized loss position for more than 12 months, Number of securities in loss position		60	62
Debt securities, held-to-maturity, unrealized loss position for more than 12 months, Number of securities in loss position		19	22