LOANS HELD-FOR-INVESTMENT - Schedule of CRE Loans on Carrying Values (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 3,515,224	$ 3,763,013
Less: Current expected credit losses	(294,748)	(392,136)
Net book value	3,220,476	3,370,877
CRE Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	3,168,597	3,466,929
Net book value	2,881,929	$ 3,085,104
First Mortgage Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Less: Current expected credit losses	(240,500)
First Mortgage Loans \| CRE Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	3,168,597
Less: Current expected credit losses	(286,668)
Net book value	$ 2,881,929
Credit loss interest rate	100.00%
First Mortgage Loans \| CRE Loans \| South
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 1,273,129
Credit loss interest rate	40.20%
First Mortgage Loans \| CRE Loans \| West
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 895,336
Credit loss interest rate	28.30%
First Mortgage Loans \| CRE Loans \| East
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 704,304
Credit loss interest rate	22.20%
First Mortgage Loans \| CRE Loans \| Various
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 295,828
Credit loss interest rate	9.30%
First Mortgage Loans \| CRE Loans \| Office
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 1,563,389
Credit loss interest rate	49.40%
First Mortgage Loans \| CRE Loans \| Multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 866,601
Credit loss interest rate	27.30%
First Mortgage Loans \| CRE Loans \| Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 349,687
Credit loss interest rate	11.00%
First Mortgage Loans \| CRE Loans \| Hospitality
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 191,965
Credit loss interest rate	6.10%
First Mortgage Loans \| CRE Loans \| Mixed Use
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 71,327
Credit loss interest rate	2.30%
First Mortgage Loans \| CRE Loans \| Retail
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 64,759
Credit loss interest rate	2.00%
First Mortgage Loans \| CRE Loans \| Self-Storage
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans held-for-investment and related receivables, net	$ 60,869
Credit loss interest rate	1.90%

Percentage, before allowance for credit loss, of financing receivable to total financing receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

+ Details

Name:	srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent
Namespace Prefix:	srt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=cmft_CommercialRealEstateLoansHeldForInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=cmft_FirstMortgageLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=srt_SouthAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=us-gaap_WestRegionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=us-gaap_EastRegionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementGeographicalAxis=cmft_VariousRegionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_OfficeBuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_MultifamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_IndustrialPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=cmft_HospitalityPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=cmft_MixedUsePropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=srt_RetailSiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=cmft_SelfStoragePropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: