Represents the obligation remaining to be funded under commitments of the entity.

No definition available.

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

- Definition

Represents the total commitment amount to purchase loan securities.

+ References

No definition available.

+ Details

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

- Definition

Represents the fixed price under commitments of the entity.

+ References

No definition available.

+ Details

Name:	ladr_FixedPriceOfCommitments
Namespace Prefix:	ladr_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the funded obligation under commitments of the entity.

+ References

No definition available.

+ Details

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

- Definition

Represents the number of extension options available under operating lease.

+ References

No definition available.

+ Details

Name:	ladr_OperatingLeaseNumberOfExtensionOptions
Namespace Prefix:	ladr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of leases entered into by the entity.

+ References

No definition available.

+ Details

Name:	ladr_OperatingLeasesNumber
Namespace Prefix:	ladr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period over which commitment is made by the entity.

+ References

No definition available.

+ Details

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

- Definition

Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.25)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 25

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 19

-Article 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 17

-Article 9

+ Details

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

- Definition

The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

+ Details

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

- Details

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

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Term of the lessee's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeasingArrangementsOperatingLeasesRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

- Details

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

- Details

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

COMMITMENTS AND CONTINGENCIES (Details) (USD $)	12 Months Ended
COMMITMENTS AND CONTINGENCIES (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012 lease Extension_Option	Dec. 31, 2011 Extension_Option
Unfunded Loan Commitments
Additional term of lease	5 years
Number of extension options			0	0
Number of leases			1ladr_OperatingLeasesNumber
Rent expense	$ 1,837,908us-gaap_LeaseAndRentalExpense	$ 1,738,083us-gaap_LeaseAndRentalExpense	$ 1,738,083us-gaap_LeaseAndRentalExpense
Mortgage loan receivables held for investment
Unfunded Loan Commitments
Unfunded commitments of mortgage loan receivables held for investment	158,135,204	71,514,519
First mortgage loan financing
Unfunded Loan Commitments
Unfunded commitments of mortgage loan receivables held for investment		65,314,519
Mezzanine loan financing
Unfunded Loan Commitments
Unfunded commitments of mortgage loan receivables held for investment		6,200,000
Commitment to purchase GN construction loan securities
Unfunded Loan Commitments
Commitment to purchase loan securities	60,048,030	150,271,380
Funded	49,438,444	112,780,499
Remaining to be funded	10,609,587	37,490,881
Fair value of commitments	$ 63,614	$ (176,736)
Commitment to purchase GN construction loan securities \| Minimum
Unfunded Loan Commitments
Period over which commitment is made to purchase loan securities	9 months
Fixed prices (in dollars per unit)	$ 102.0	$ 102.0
Commitment to purchase GN construction loan securities \| Maximum
Unfunded Loan Commitments
Period over which commitment is made to purchase loan securities	15 months
Fixed prices (in dollars per unit)	$ 104.4	$ 107.3