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Indicates type of investment. Includes, but is not limited to, common stock, preferred stock, convertible security, fixed income security, government security, option purchased, warrant, loan participation and assignment, commercial paper, bankers' acceptance, certificates of deposit, short-term security, repurchase agreement, and other investment company.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12(Column C)(Footnote 5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-12A(Column C)(Footnote 4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column C)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column F)(Footnote 7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-12A(Column A)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column A)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12(Column A)(Footnote 2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column A)(Footnote 1)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3

+ Details

Name:	us-gaap_InvestmentTypeExtensibleEnumeration
Namespace Prefix:	us-gaap_
Data Type:	enum2:enumerationSetItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=cmtg_ForbearanceAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=cmtg_SecuredTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=cmtg_RepurchaseAgreementsAndTermParticipationFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=cmtg_NewSecuredTermLoanMember
Namespace Prefix:
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Balance Type:
Period Type:

Debt Obligations - Additional Information (Details) - USD ($)					1 Months Ended	3 Months Ended								7 Months Ended	9 Months Ended		12 Months Ended
	Jun. 09, 2025	Feb. 09, 2025	Dec. 02, 2021	Feb. 08, 2021	Jan. 31, 2026	Dec. 31, 2028	Sep. 30, 2028	Jun. 30, 2028	Mar. 31, 2028	Dec. 31, 2027	Sep. 30, 2027	Sep. 30, 2026	Sep. 30, 2025	Sep. 09, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Debt Instrument [Line Items]
Loss on extinguishment of debt												$ 0	$ 0		$ 5,898,000	$ 547,000
One-month SOFR			4.50%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]															Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Principal payments				$ 25,000,000										$ 5,000,000
Senior mortgage amount	$ 235,000,000			$ 300,000,000
Contractual Maturity Date	Jun. 09, 2030			Feb. 09, 2025
Financing agreements, covenants description															Our financing agreements generally contain certain financial covenants. As of September 30, 2026, we are in compliance with all financial covenants under our financing agreements.
Investment, Type [Extensible Enumeration]	Real Estate Investment [Member]			Real Estate Investment [Member]
Minimum
Debt Instrument [Line Items]
Strike rate				3.00%
Maximum
Debt Instrument [Line Items]
Strike rate				5.00%
Forbearance Agreement
Debt Instrument [Line Items]
Contractual Maturity Date		Sep. 09, 2025
Secured Term Loan
Debt Instrument [Line Items]
Secured term loan					$ 500,000,000
Loss on extinguishment of debt					5,900,000
Transaction costs					23,200,000
Original issue discount and deferred financing costs					$ 486,500,000
One-month SOFR					6.75%
Debt instrument floor rate					2.50%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]					Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]										Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Contractual Maturity Date					Jan. 30, 2030										Jan. 30, 2030		Aug. 09, 2026
Secured Term Loan \| Minimum
Debt Instrument [Line Items]
One-month SOFR			0.10%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Secured Term Loan \| Maximum
Debt Instrument [Line Items]
One-month SOFR			0.50%
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]			Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Repurchase Agreements and Term Participation Facility
Debt Instrument [Line Items]
Percentage of aggregate cash proceeds from equity issuances, capital contributions and subscriptions, net															75.00%
Repurchase Agreements and Term Participation Facility \| Minimum
Debt Instrument [Line Items]
Ratio of total debt to equity ratio shall not exceed															3.50%	3.50%
Tangible networth as of measurement date															$ 1,000,000,000
Cash liquidity amount to be maintained												$ 20,000,000			$ 20,000,000
Percentage of recourse indebtedness															5.00%
Repurchase Agreements and Term Participation Facility \| Minimum \| Scenario Forecast
Debt Instrument [Line Items]
Ratio of earnings before interest, taxes, depreciation and amortization to interest charges						1.30%	1.30%	1.20%	1.20%	1.10%	1.10%
New Secured Term Loan \| Minimum
Debt Instrument [Line Items]
Ratio of total debt to equity ratio shall not exceed															3.50%	3.50%
Tangible networth as of measurement date															$ 1,000,000,000
New Secured Term Loan \| Minimum \| Scenario Forecast
Debt Instrument [Line Items]
Ratio of earnings before interest, taxes, depreciation and amortization to interest charges						1.30%	1.30%	1.20%	1.20%	1.10%	1.10%
New Secured Term Loan \| Maximum
Debt Instrument [Line Items]
Percentage of aggregate cash proceeds from equity issuances, capital contributions and subscriptions, net															75.00%