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Repurchase Agreements - Repurchase Agreements Secured by Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	$ 664,459	$ 50,077
Value of Assets Pledged	3,136,812	3,525,080
Repurchase agreements
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	664,459	50,077
Value of Assets Pledged	803,745	170,551
Amortized Cost of Collateral Pledged	862,751	210,733
Agency RMBS | Repurchase agreements
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	574,225	0
Value of Assets Pledged	602,306	0
Amortized Cost of Collateral Pledged	609,772	0
Non-Agency RMBS | Repurchase agreements
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	90,234	50,077
Value of Assets Pledged	201,439	170,551
Amortized Cost of Collateral Pledged	252,979	$ 210,733
Non-Agency RMBS | Repurchase agreements | Residential Loan Securitizations
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost of Collateral Pledged	49,800
Non-Agency RMBS | Repurchase agreements | Consolidated SLST
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost of Collateral Pledged	$ 151,600

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Assets Sold Under Agreements To Repurchase, Amortized Cost Of Collateral Pledged

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(ii)(A))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(ii)(A)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1

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