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DEBT OBLIGATIONS, NET - Uncommitted Securities Repurchase Facilities (Details) - Uncommitted Securities Repurchase Facilities	3 Months Ended
	Mar. 31, 2023
Minimum
Debt Instrument [Line Items]
Advance rates	75.00%
Maximum
Debt Instrument [Line Items]
Advance rates	95.00%

X

- Definition

Represents the advance rates as a percentage of collateral.

+ References

No definition available.

+ Details

Name:	ladr_DebtInstrumentAdvanceRatesPercentageOfCollateral
Namespace Prefix:	ladr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

No definition available.

+ Details

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

X

- Details

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

X

- Details

Name:	us-gaap_SecuritiesFinancingTransactionAxis=ladr_UncommittedSecuritiesRepurchaseFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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