Debt Instrument, Entity Share Of Outstanding Principal, Percent

No definition available.

Name:	kref_DebtInstrumentEntityShareOfOutstandingPrincipalPercent
Namespace Prefix:	kref_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Number Of Loan Investments Used As Collateral

+ References

No definition available.

+ Details

Name:	kref_DebtInstrumentNumberOfLoanInvestmentsUsedAsCollateral
Namespace Prefix:	kref_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Loan, Held-In-Portfolio, Fair Value

+ References

No definition available.

+ Details

Name:	kref_LoanHeldInPortfolioFairValue
Namespace Prefix:	kref_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long-Term Debt, Gross, Percentage

+ References

No definition available.

+ Details

Name:	kref_LongTermDebtGrossPercentage
Namespace Prefix:	kref_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Related Party Transaction, Expenses from Transactions with Related Party1

+ References

No definition available.

+ Details

Name:	kref_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty1
Namespace Prefix:	kref_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Related Party Transaction, Expenses From Transactions With Related Party, As A Percent Of Weighted Average Adjusted Equity

+ References

No definition available.

+ Details

Name:	kref_RelatedPartyTransactionExpensesFromTransactionsWithRelatedPartyAsAPercentOfWeightedAverageAdjustedEquity
Namespace Prefix:	kref_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Expenses From Transactions With Related Party, Denominator For Incentive Compensation, Number Of Calendar Quarter's Compensation Subtracted

+ References

No definition available.

+ Details

Name:	kref_RelatedPartyTransactionExpensesFromTransactionsWithRelatedPartyDenominatorForIncentiveCompensationNumberOfCalendarQuartersCompensationSubtracted
Namespace Prefix:	kref_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Expenses From Transactions With Related Party, Denominator For Incentive Compensation, Percentage Of Adjusted Equity

+ References

No definition available.

+ Details

Name:	kref_RelatedPartyTransactionExpensesFromTransactionsWithRelatedPartyDenominatorForIncentiveCompensationPercentageOfAdjustedEquity
Namespace Prefix:	kref_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Expenses From Transactions With Related Party, Denominator For Incentive Compensation, Period Of Adjusted Equity

+ References

No definition available.

+ Details

Name:	kref_RelatedPartyTransactionExpensesFromTransactionsWithRelatedPartyDenominatorForIncentiveCompensationPeriodOfAdjustedEquity
Namespace Prefix:	kref_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Expenses From Transactions With Related Party, Incentive Compensation Percentage

+ References

No definition available.

+ Details

Name:	kref_RelatedPartyTransactionExpensesFromTransactionsWithRelatedPartyIncentiveCompensationPercentage
Namespace Prefix:	kref_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Expenses From Transactions With Related Party, Numerator For Incentive Compensation, Period Of Adjusted Earnings

+ References

No definition available.

+ Details

Name:	kref_RelatedPartyTransactionExpensesFromTransactionsWithRelatedPartyNumeratorForIncentiveCompensationPeriodOfAdjustedEarnings
Namespace Prefix:	kref_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Minimum Voting Percentage For Renewal Of Agreement Term

+ References

No definition available.

+ Details

Name:	kref_RelatedPartyTransactionMinimumVotingPercentageForRenewalOfAgreementTerm
Namespace Prefix:	kref_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Termination Fee Multiple

+ References

No definition available.

+ Details

Name:	kref_RelatedPartyTransactionTerminationFeeMultiple
Namespace Prefix:	kref_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Related Party Transaction, Trailing Period Applied To Multiple For Termination Fee

+ References

No definition available.

+ Details

Name:	kref_RelatedPartyTransactionTrailingPeriodAppliedToMultipleForTerminationFee
Namespace Prefix:	kref_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Variable Interest Entity, Qualitative Or Quantitative Information, Ownership Percentage Of Partner

+ References

No definition available.

+ Details

Name:	kref_VariableInterestEntityQualitativeOrQuantitativeInformationOwnershipPercentageOfPartner
Namespace Prefix:	kref_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-4

+ Details

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

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(e)(1)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(15)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 970
-SubTopic 810
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477383/970-810-45-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-3

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

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

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-5A

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=kref_UnconsolidatedEnityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	dei_LegalEntityAxis=kref_KREFMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=kref_RealEstateAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=kref_KKRAffiliateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_RelatedPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=kref_ManagementAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=kref_QuarterlyManagementFeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=kref_KREFManagerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=kref_QuarterlyIncentiveCompensationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Transactions - Narrative (Details)	1 Months Ended		6 Months Ended
Related Party Transactions - Narrative (Details)	Jun. 30, 2025 loan	Jun. 30, 2024	Jun. 30, 2026 USD ($) calendarQuarter	Oct. 31, 2025
Related Party Transaction [Line Items]
Outstanding Principal			$ 3,030,626,000
Secured financing agreements, net
Related Party Transaction [Line Items]
Outstanding Principal			3,030,626,000
Secured term loan, net \| KREF Lending XVI \| Secured financing agreements, net
Related Party Transaction [Line Items]
Outstanding Principal			$ 129,000,000.0
Share of the outstanding financing principal, percent			0.267
Secured term loan, net \| KREF Lending XX - EUR \| Secured financing agreements, net
Related Party Transaction [Line Items]
Outstanding Principal			$ 114,486,000
Commercial Mortgage-Backed Securities
Related Party Transaction [Line Items]
Fair value			$ 24,100,000
Unconsolidated Enity
Related Party Transaction [Line Items]
Equity interest (as a percent)				50.00%
Seattle, WA \| KREF \| Real Estate Asset
Related Party Transaction [Line Items]
Equity interest (as a percent)		74.60%
Seattle, WA \| KKR Affiliate \| Real Estate Asset
Related Party Transaction [Line Items]
Equity interest (as a percent)		25.40%
Primary beneficiary \| Mountain View, CA \| KREF
Related Party Transaction [Line Items]
Ownership percentage in VIE (as a percent)		68.90%
Primary beneficiary \| Mountain View, CA \| KKR Affiliate
Related Party Transaction [Line Items]
Ownership percentage of partner (as a percent)		31.10%
Related party \| KREF
Related Party Transaction [Line Items]
Number of loan investments used as collateral \| loan	2
Interest rate of principal (as a percent)			50.00%
Related party \| KKR Affiliate \| Commercial Mortgage-Backed Securities
Related Party Transaction [Line Items]
Fair value			$ 63,200,000
Management Agreement
Related Party Transaction [Line Items]
Minimum voting percentage for renewal of agreement term			66.67%
Termination fee			3
Trailing average period applied to termination fee multiple under management agreement (Months)			24 months
Quarterly Management Fee \| KREF Manager \| Related party
Related Party Transaction [Line Items]
Related party transaction expenses			$ 62,500
Management fee as a percent of weighted average adjusted equity (greater of)			0.375%
Quarterly Incentive Compensation \| KREF Manager
Related Party Transaction [Line Items]
Incentive compensation fee percent (as a percent)			20.00%
Period of adjusted earnings (Months)			12 months
Percent of trailing 12 month weighted average adjusted equity (as a percent)			7.00%
Period of weighted average adjusted equity (Months)			12 months
Number of quarters worth of compensation already paid (calendar quarters) \| calendarQuarter			3