Related Party Transactions - Schedule of Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Zions Bancorporation, National Association | Sales of Farmer Mac Guaranteed Securities
Related Party Transaction [Line Items]
Sales of Farmer Mac Guaranteed Securities	$ 99,643	$ 0	$ 41,247
Zions Bancorporation, National Association | USDA Guarantee | USDA Securities:
Related Party Transaction [Line Items]
Unpaid principal balance	4,171	9,565	10,764
Zions Bancorporation, National Association | Mortgages | Farm & Ranch
Related Party Transaction [Line Items]
Unpaid principal balance	274,517	214,319	177,143
CFC | AgVantage Securities | Guarantee Obligations
Related Party Transaction [Line Items]
Unpaid principal balance	670,000	1,450,000	250,000
CFC | AgVantage Securities | Revolving Credit Facility | Off-balance sheet
Related Party Transaction [Line Items]
Unpaid principal balance	30,421	0	0
CFC | AgVantage Securities | US Government-sponsored Enterprises Debt Securities
Related Party Transaction [Line Items]
Unpaid principal balance	1,087,419	1,577,117	522,943
CFC | Real Estate Loan
Related Party Transaction [Line Items]
Unpaid principal balance	$ 386,998	$ 127,117	$ 272,943