Loans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 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	(617)	$ (366)	699	$ (518)
Rural Infrastructure Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Release of/(provision for) losses	(418)	120	1,793	(701)
Agricultural Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Release of/(provision for) losses	$ (181)	(414)	$ (838)	$ 239
Farm & Ranch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Release of/(provision for) losses		$ (400)