Fair Value Disclosures - Summary of Carrying Value and Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financial assets:
Financial derivatives	$ 25,099	$ 37,409
Guarantee and commitment fees receivable	46,670	47,151
Financial liabilities:
Financial derivatives	166,963	175,326
Guarantee and commitment obligation	46,114	46,582
Fair Value
Financial assets:
Cash and cash equivalents	864,594	861,002
Loans	10,063,805	9,666,710
Financial derivatives	25,099	37,409
Guarantee and commitment fees receivable	54,060	50,653
Financial liabilities:
Notes payable	24,088,548	23,591,330
Debt securities of consolidated trusts held by third parties	1,365,378	1,106,837
Financial derivatives	166,963	175,326
Guarantee and commitment obligation	53,503	50,083
Fair Value | Investment securities:
Financial assets:
Marketable securities	4,696,779	4,630,701
Fair Value | Farmer Mac Guaranteed Securities
Financial assets:
Marketable securities	9,175,211	8,573,781
Fair Value | USDA Securities:
Financial assets:
Marketable securities	2,143,982	2,099,445
Carrying Amount
Financial assets:
Cash and cash equivalents	864,594	861,002
Loans	10,368,340	10,205,466
Financial derivatives	25,099	37,409
Guarantee and commitment fees receivable	46,670	47,151
Financial liabilities:
Notes payable	24,837,391	24,469,113
Debt securities of consolidated trusts held by third parties	1,374,332	1,181,948
Financial derivatives	166,963	175,326
Guarantee and commitment obligation	46,114	46,582
Carrying Amount | Investment securities:
Financial assets:
Marketable securities	4,696,168	4,628,268
Carrying Amount | Farmer Mac Guaranteed Securities
Financial assets:
Marketable securities	9,219,420	8,628,380
Carrying Amount | USDA Securities:
Financial assets:
Marketable securities	$ 2,360,333	$ 2,411,601