Assets Purchased under Resale Agreements and Sold under Repurchase Agreements - Resale Agreements and Repurchase Agreements (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
Resale agreements
Gross resale agreements	$ 1,130,000		$ 1,130,000		$ 1,330,000
Average yield	1.96%	1.54%	1.79%	1.55%
Loans purchased under agreements to resell	$ 289,800		$ 289,800		1,020,000
Repurchase agreements
Gross repurchase agreements	$ 611,785		$ 611,785		$ 300,000
Average rate paid	2.70%	2.63%	2.66%	2.65%
SecuritiesSoldUnderAgreementsToRepurchaseMaturinginYearCurrent	$ 311,800		$ 311,800
SecuritiesSoldUnderAgreementsToRepurchaseMaturinginYearOne	$ 300,000		$ 300,000
Loans Purchased Under Resale Agreements
Resale agreements
Weighted-average yields	2.47%	1.47%	1.91%	1.64%