Represents the outstanding face amount of assets.

No definition available.

Name:	ladr_AssetsOutstandingFaceAmount
Namespace Prefix:	ladr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the remaining maturity period of available-for-sale securities under each classification.

+ References

No definition available.

+ Details

Name:	ladr_AvailableForSaleSecuritiesRemainingMaturityPeriod
Namespace Prefix:	ladr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the liabilities at amortized cost basis.

+ References

No definition available.

+ Details

Name:	ladr_DebtInstrumentAmortizedCostBasis
Namespace Prefix:	ladr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Securities, Available For Sale, Before Allowance For Credit Loss

+ References

No definition available.

+ Details

Name:	ladr_DebtSecuritiesAvailableForSaleBeforeAllowanceForCreditLoss
Namespace Prefix:	ladr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the outstanding face amount of liabilities.

+ References

No definition available.

+ Details

Name:	ladr_LiabilitiesOutstandingFaceAmount
Namespace Prefix:	ladr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the period of short interest rate reset risk.

+ References

No definition available.

+ Details

Name:	ladr_PeriodOfShortInterestRateResetRisk
Namespace Prefix:	ladr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

+ Details

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

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

+ Details

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

- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 103
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-103

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average yield of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Regulation S-K (SK)
-Number 229
-Section 1403
-Paragraph a
-Publisher SEC

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleWeightedAverageYield
Namespace Prefix:	us-gaap_
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

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)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: 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

+ Details

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

- References

No definition available.

+ Details

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

FAIR VALUE OF FINANCIAL INSTRUMENTS - Estimated Fair Values of Financial Instruments (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)	Mar. 31, 2026 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Assets:
Amortized Cost Basis/Purchase Price	$ 1,865,669	$ 2,079,918
Fair Value	$ 1,860,878	$ 2,075,606
Liabilities:
Weighted Average, Yield	5.19%	5.33%
Remaining Duration (years)	2 years 11 months 23 days	2 years 11 months 19 days
Allowance for credit losses	$ (47,095)	$ (47,137)	$ (47,109)	$ (52,166)	$ (52,208)	$ (52,323)
Total mortgage loans receivable
Assets:
Principal Amount	2,810,014	2,234,346
CMBS
Assets:
Principal Amount	1,855,960	2,070,492
Amortized Cost Basis/Purchase Price	1,855,743	2,069,307
Fair Value	$ 1,850,905	$ 2,064,922
Liabilities:
Weighted Average, Yield	5.17%	5.31%
Remaining Duration (years)	2 years 11 months 26 days	2 years 11 months 19 days
CMBS \| Internal model \| Yield %
Liabilities:
Financial instruments, measurement input	0.0517	0.0531
CMBS \| Internal model \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input		2.97
CMBS interest-only
Assets:
Principal Amount	$ 172,725	$ 347,200
Amortized Cost Basis/Purchase Price	606	1,283
Fair Value	$ 626	$ 1,275
Liabilities:
Weighted Average, Yield	8.56%	8.63%
Remaining Duration (years)	3 months 14 days	6 months 7 days
CMBS interest-only \| Internal model \| Yield %
Liabilities:
Financial instruments, measurement input	0.0856	0.0863
CMBS interest-only \| Internal model \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input		0.52
GNMA interest-only
Assets:
Principal Amount	$ 27,498	$ 29,203
Amortized Cost Basis/Purchase Price	86	95
Fair Value	$ 156	$ 167
Liabilities:
Weighted Average, Yield	9.17%	9.24%
Remaining Duration (years)	3 years 6 months	3 years 3 months 7 days
GNMA interest-only \| Internal model \| Yield %
Liabilities:
Financial instruments, measurement input	0.0917	0.0924
GNMA interest-only \| Internal model \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input		3.27
Agency securities
Assets:
Principal Amount		$ 2
Amortized Cost Basis/Purchase Price		2
Fair Value		$ 2
Liabilities:
Weighted Average, Yield		3.04%
Remaining Duration (years)		2 months 8 days
Agency securities \| Internal model \| Yield %
Liabilities:
Financial instruments, measurement input		0.0304
Agency securities \| Internal model \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input		0.19
Corporate bonds
Assets:
Principal Amount	$ 9,250	$ 9,250
Amortized Cost Basis/Purchase Price	9,234	9,231
Fair Value	$ 9,191	$ 9,240
Liabilities:
Weighted Average, Yield	8.58%	8.58%
Remaining Duration (years)	2 years 1 month 24 days	2 years 7 months 6 days
Corporate bonds \| Internal model, third-party inputs \| Yield %
Liabilities:
Financial instruments, measurement input	0.0858	0.0858
Corporate bonds \| Internal model, third-party inputs \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input		2.60
Equity securities
Assets:
Amortized Cost Basis/Purchase Price	$ 13,639	$ 12,910
Fair Value	11,581	12,699
Mortgage loan receivables held for investment, net, at amortized cost
Assets:
Amortized Cost Basis/Purchase Price	2,790,138	2,217,375
Fair Value	$ 2,789,567	$ 2,214,987
Liabilities:
Period of short interest rate reset risk	30 days	30 days
Mortgage loan receivables held for investment, net, at amortized cost \| Discounted Cash Flow
Liabilities:
Allowance for credit losses	$ (47,100)	$ (47,100)
Mortgage loan receivables held for investment, net, at amortized cost \| Discounted Cash Flow \| Yield %
Liabilities:
Financial instruments, measurement input	0.0726	0.0776
Mortgage loan receivables held for investment, net, at amortized cost \| Discounted Cash Flow \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input	1.85	1.57
Mortgage loan receivables held for sale
Assets:
Principal Amount	$ 31,350	$ 31,350
Amortized Cost Basis/Purchase Price	27,205	27,986
Fair Value	$ 27,205	$ 27,986
Mortgage loan receivables held for sale \| Internal model, third-party inputs \| Yield %
Liabilities:
Financial instruments, measurement input	0.0457	0.0457
Mortgage loan receivables held for sale \| Internal model, third-party inputs \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input	6.55	6.92
Nonhedge derivatives
Assets:
Principal Amount	$ 101,900	$ 113,500
Amortized Cost Basis/Purchase Price	116	264
Fair Value	$ 116	$ 264
Nonhedge derivatives \| Counterparty quotations \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input	0.23	0.22
Repurchase agreements - short-term
Liabilities:
Principal Amount	$ 825,936	$ 627,012
Amortized Cost Basis/Purchase Price	825,937	627,012
Fair Value	$ 825,937	$ 627,012
Repurchase agreements - short-term \| Cost plus Accrued Interest \| Yield %
Liabilities:
Financial instruments, measurement input	0.0413	0.0429
Repurchase agreements - short-term \| Cost plus Accrued Interest \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input	0.04	0.04
Repurchase agreements - long-term \| Recurring
Liabilities:
Principal Amount	$ 107,228
Amortized Cost Basis/Purchase Price	107,228
Fair Value	$ 107,228
Repurchase agreements - long-term \| Discounted Cash Flow \| Yield % \| Recurring
Liabilities:
Financial instruments, measurement input	0.0507
Repurchase agreements - long-term \| Discounted Cash Flow \| Remaining Maturity/Duration (years) \| Recurring
Liabilities:
Financial instruments, measurement input	4.45
Unsecured Revolving Credit Facility
Liabilities:
Principal Amount	$ 202,000	$ 280,000
Amortized Cost Basis/Purchase Price	202,000	280,000
Fair Value	$ 202,000	$ 280,000
Unsecured Revolving Credit Facility \| Yield %
Liabilities:
Financial instruments, measurement input	0.0487	0.0242
Unsecured Revolving Credit Facility \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input	2.48	2.97
Term Loan Facility
Liabilities:
Principal Amount	$ 275,000
Fair Value	$ 275,000
Term Loan Facility \| Yield %
Liabilities:
Financial instruments, measurement input	0.0500
Term Loan Facility \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input	2.65
Mortgage loan financing
Liabilities:
Principal Amount	$ 386,017	$ 386,543
Amortized Cost Basis/Purchase Price	387,485	388,195
Fair Value	$ 382,848	$ 385,460
Mortgage loan financing \| Discounted Cash Flow \| Yield %
Liabilities:
Financial instruments, measurement input	0.0588	0.0588
Mortgage loan financing \| Discounted Cash Flow \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input	3.65	4.01
Senior unsecured notes
Liabilities:
Principal Amount	$ 2,222,993	$ 2,233,409
Amortized Cost Basis/Purchase Price	2,207,255	2,215,195
Fair Value	$ 2,229,452	$ 2,265,416
Senior unsecured notes \| Internal model \| Yield %
Liabilities:
Financial instruments, measurement input	0.0529	0.0529
Senior unsecured notes \| Internal model \| Remaining Maturity/Duration (years)
Liabilities:
Financial instruments, measurement input	3.06	3.54