Assets Purchased under Resale Agreements and Sold under Repurchase Agreements - Resale Agreements and Repurchase Agreements (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
Resale agreements
Gross resale agreements	$ 885,000		$ 885,000		$ 1,330,000
Average yield	2.41%	1.50%	1.96%	1.53%
Loans purchased under agreements to resell	$ 8,000		$ 8,000		1,020,000
Repurchase agreements
Gross repurchase agreements	$ 611,785		$ 611,785		$ 300,000
Average rate paid	2.81%	2.57%	2.73%	2.62%
SecuritiesSoldUnderAgreementsToRepurchaseMaturinginYearCurrent	$ 311,800		$ 311,800
SecuritiesSoldUnderAgreementsToRepurchaseMaturinginYearOne	$ 300,000		$ 300,000
Loans Purchased Under Resale Agreements
Resale agreements
Weighted-average yields	3.87%	1.48%	2.10%	1.57%