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Repurchase Agreements - Repurchase Agreements Secured by Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	$ 2,057,361	$ 1,862,063
Value of Assets Pledged	3,103,105	3,084,303
Accrued interest payable	16,800	13,600
Single Family
Assets Sold under Agreements to Repurchase [Line Items]
Value of Assets Pledged	141,400	146,700
Agency RMBS And Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	2,057,361	1,862,063
Value of Assets Pledged	2,239,331	2,076,435
Amortized Cost of Collateral Pledged	2,290,661	2,102,412
Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	1,991,485	1,771,436
Value of Assets Pledged	2,097,364	1,894,052
Amortized Cost of Collateral Pledged	2,098,851	1,869,415
Non-Agency RMBS
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	65,876	90,627
Value of Assets Pledged	141,967	182,383
Amortized Cost of Collateral Pledged	191,810	232,997
Non-Agency RMBS | Residential Loan Securitizations
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost of Collateral Pledged	6,900	42,100
Non-Agency RMBS | Consolidated SLST
Assets Sold under Agreements to Repurchase [Line Items]
Amortized Cost of Collateral Pledged	$ 135,100	$ 140,300

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- Definition

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ 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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