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DEBT OBLIGATIONS, NET - Senior Unsecured Notes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Gain on extinguishment of debt	$ 10,718,000	$ 685,000	$ 0
Ladder Capital Finance Corporation \| LCFH
Debt Instrument [Line Items]
Ownership interest in LCFC	100.00%
Senior Unsecured Notes
Debt Instrument [Line Items]
Senior Unsecured Notes	$ 1,600,000,000
Extinguishment of debt, aggregate gain	10,700,000
Senior Notes Due 2025 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Loan refinance	$ 327,800,000
Stated interest rate on debt instrument	5.25%
Notes repurchased	$ 16,200,000
Gain on extinguishment of debt	1,300,000
Senior Notes Due 2027 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Loan refinance	$ 611,900,000
Stated interest rate on debt instrument	4.25%
Notes repurchased	$ 38,900,000
Gain on extinguishment of debt	6,800,000
Senior Notes Due 2029 \| Senior Unsecured Notes
Debt Instrument [Line Items]
Loan refinance	$ 635,900,000
Stated interest rate on debt instrument	4.75%
Notes repurchased	$ 13,100,000
Gain on extinguishment of debt	$ 2,600,000