Secured Financing Agreements - Schedule of Secured Financing Agreements (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Assets Sold under Agreements to Repurchase [Line Items]
Secured financing agreements outstanding principal secured by:	$ 3,228,748	$ 2,432,115
Repurchase Agreements
Assets Sold under Agreements to Repurchase [Line Items]
Secured financing agreements outstanding principal secured by:	3,235,072	2,444,091
Average balance of Secured financing agreements secured by:	2,867,382	2,836,314
Repurchase Agreements | Asset Pledged as Collateral
Assets Sold under Agreements to Repurchase [Line Items]
MBS pledged as collateral at fair value on Secured financing agreements:	4,553,156	3,539,416
Repurchase Agreements | Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Secured financing agreements outstanding principal secured by:	837,204	0
Average balance of Secured financing agreements secured by:	$ 472,153	1,551
Average borrowing rate of Secured financing agreements secured by:	5.43%
Average remaining maturity of Secured financing agreements secured by:	9 days
Average original maturity of Secured financing agreements secured by:	36 days
Repurchase Agreements | Agency RMBS | Asset Pledged as Collateral
Assets Sold under Agreements to Repurchase [Line Items]
MBS pledged as collateral at fair value on Secured financing agreements:	$ 887,721	0
Repurchase Agreements | Agency CMBS
Assets Sold under Agreements to Repurchase [Line Items]
Secured financing agreements outstanding principal secured by:	29,627	68,502
Average balance of Secured financing agreements secured by:	$ 37,507	$ 139,746
Average borrowing rate of Secured financing agreements secured by:	5.34%	5.60%
Average remaining maturity of Secured financing agreements secured by:	7 days	32 days
Average original maturity of Secured financing agreements secured by:	28 days	86 days
Repurchase Agreements | Agency CMBS | Asset Pledged as Collateral
Assets Sold under Agreements to Repurchase [Line Items]
MBS pledged as collateral at fair value on Secured financing agreements:	$ 30,464	$ 74,345
Repurchase Agreements | Non-agency MBS and Loans held for investment
Assets Sold under Agreements to Repurchase [Line Items]
Secured financing agreements outstanding principal secured by:	2,368,241	2,375,589
Average balance of Secured financing agreements secured by:	$ 2,357,722	$ 2,695,017
Average borrowing rate of Secured financing agreements secured by:	7.17%	7.56%
Average remaining maturity of Secured financing agreements secured by:	298 days	418 days
Average original maturity of Secured financing agreements secured by:	320 days	445 days
Repurchase Agreements | Non-agency MBS and Loans held for investment | Asset Pledged as Collateral
Assets Sold under Agreements to Repurchase [Line Items]
MBS pledged as collateral at fair value on Secured financing agreements:	$ 3,634,971	$ 3,465,071