Loans - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at lower of cost or fair value	$ 0	$ 0
Number of operating segments | segment	7
(Provision for)/release of losses	$ (1,323)	860	$ (7,805)
Current period charge-offs			5,800
Rural Infrastructure Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
(Provision for)/release of losses	2,285	(512)	(4,709)
Current period charge-offs	$ 0	0	0
Agricultural Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of operating segments | segment	2
(Provision for)/release of losses	$ (3,417)	1,357	(2,959)
Current period charge-offs	(84)		5,759
Farm & Ranch
Accounts, Notes, Loans and Financing Receivable [Line Items]
(Provision for)/release of losses	(1,246)	1,576	(3,068)
Current period charge-offs	$ (84)	$ 0	$ 5,759