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Loans Held for Investment, net - Loan Portfolio Statistics (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Receivables [Abstract]
Number of loans | loan	25	27
Total loan commitments	$ 674,475	$ 727,562
Unfunded loan commitments	45,779	49,007
Principal balance	628,696	678,555	$ 636,831	$ 590,590
Carrying value	$ 617,935	$ 669,929
Weighted average coupon rate	8.57%	8.07%
Weighted average all in yield	9.06%	8.57%
Weighted average floor	0.65%	0.62%
Weighted average maximum maturity (years)	3 years 1 month 6 days	3 years 3 months 18 days
Weighted average risk rating	2.9	2.9

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Loans Receivable, Weighted Average Coupon Rate, Percentage

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Mortgage Loans On Real Estate, Weighted Average Risk Rating Of Portfolio

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Amount of contractual principal due at origination of mortgage loan within 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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph Column F
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
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Number of mortgage loans within 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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 3
-Subsection 29

Reference 2: 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(Footnote 3))
-URI https://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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