Loans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at lower of cost or fair value	$ 0		$ 0		$ 0
Release of/(provision for) losses	1,372	$ 761	1,316	$ (152)
Rural Infrastructure Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Release of/(provision for) losses	1,234	181	2,211	(821)
Agricultural Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Release of/(provision for) losses	$ (67)	626	$ (657)	$ 653
Farm & Ranch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Release of/(provision for) losses		$ 600