Assets Purchased under Resale Agreements and Sold under Repurchase Agreements - Resale Agreements (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Offsetting Assets [Line Items]
Gross resale agreements	$ 785,000,000		$ 785,000,000		$ 760,000,000
Average yield	2.73%	2.41%	2.55%	1.96%
Loans purchased under agreements to resell	$ 0		$ 0		$ 32,200,000
Loans Purchased Under Resale Agreements
Offsetting Assets [Line Items]
Weighted-average yields		3.87%	7.27%	2.10%