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Repurchase Agreements - Repurchase Agreements Secured by Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	$ 144,852
Fair Value of Loans Pledged	3,953,427	$ 3,575,601
Repurchase agreements
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	144,852
Fair Value of Loans Pledged	281,267
Amortized Cost of Collateral Pledged	302,142
Non-Agency RMBS | Repurchase agreements
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	127,900
Fair Value of Loans Pledged	249,691
Amortized Cost of Collateral Pledged	269,542
Restricted cash	5,500
Non-Agency RMBS | Repurchase agreements | Consolidated SLST
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of Loans Pledged	198,000
CMBS | Repurchase agreements
Assets Sold under Agreements to Repurchase [Line Items]
Outstanding Repurchase Agreements	16,952
Fair Value of Loans Pledged	31,576
Amortized Cost of Collateral Pledged	$ 32,600

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

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(ii)(A)(ii))
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-Name Accounting Standards Codification
-Topic 235
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-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Name Accounting Standards Codification
-Topic 944
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-Section S99
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