Assets Purchased under Resale Agreements and Sold under Repurchase Agreements - Repurchase Agreements (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Amount of securities sold under repurchase agreements
Gross repurchase agreements	$ 0			$ 0		$ 300,000,000
Extinguishment repurchase agreements, amount		$ 300,000,000
Repurchase agreements’ extinguishment cost			$ 0	$ 3,900,000	$ 0
Average rate paid	5.51%		2.81%	4.32%	2.73%