Revision of Prior Period Financial Statements - Schedule of Revised Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest income:
Farmer Mac Guaranteed Securities and USDA Securities	$ 74,695			$ 42,339			$ 169,231	$ 127,976
Total interest income	193,790			108,383			449,121	323,714
Net interest income	67,853			58,916			197,305	168,115
Non-interest income/(expense):
Gains/(losses) on financial derivatives	772			(888)			21,551	2,581
Non-interest income	4,192			3,250			33,272	14,855
Income before income taxes	52,049			44,693			170,461	129,586
Income tax expense	10,631			9,388			35,735	27,350
Net income	41,418	$ 41,855	$ 51,453	35,305	$ 28,863	$ 38,069	134,726	102,236
Net income attributable to common stockholders	$ 34,627			28,531			$ 114,352	84,351
As previously Reported
Interest income:
Farmer Mac Guaranteed Securities and USDA Securities				38,428				123,246
Total interest income				104,472				318,984
Net interest income				55,005				163,385
Non-interest income/(expense):
Gains/(losses) on financial derivatives				(2,347)				(1,120)
Non-interest income				1,791				11,154
Income before income taxes				39,323				121,155
Income tax expense				8,260				25,579
Net income		45,896	47,837	31,063	31,286	33,227		95,576
Net income attributable to common stockholders				24,289				77,691
Adjustments
Interest income:
Farmer Mac Guaranteed Securities and USDA Securities				3,911				4,730
Total interest income				3,911				4,730
Net interest income				3,911				4,730
Non-interest income/(expense):
Gains/(losses) on financial derivatives				1,459				3,701
Non-interest income				1,459				3,701
Income before income taxes				5,370				8,431
Income tax expense				1,128				1,771
Net income		$ (4,041)	$ 3,616	4,242	$ (2,423)	$ 4,842		6,660
Net income attributable to common stockholders				$ 4,242				$ 6,660