Repurchase Agreements - Schedule of Repurchase Agreements Secured by Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	$ 3,045,597	$ 1,862,063
Fair Value of Collateral Pledged	3,777,144	3,084,303
Agency RMBS, Non-Agency RMBS And U.S. Treasury Securities
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	3,045,597	1,862,063
Fair Value of Collateral Pledged	3,197,434	2,076,435
Amortized Cost of Collateral Pledged	3,154,874	2,102,412
Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	2,638,460	1,771,436
Fair Value of Collateral Pledged	2,773,633	1,894,052
Amortized Cost of Collateral Pledged	2,732,190	1,869,415
Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	54,197	90,627
Fair Value of Collateral Pledged	70,432	182,383
Amortized Cost of Collateral Pledged	65,573	232,997
Non-Agency RMBS | Financing VIEs
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost of Collateral Pledged		42,100
Non-Agency RMBS | Consolidated SLST
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost of Collateral Pledged	25,400	140,300
U.S. Treasury securities
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	352,940	0
Fair Value of Collateral Pledged	353,369	0
Amortized Cost of Collateral Pledged	357,111	$ 0
Restricted cash	$ 4,300