MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2026 USD ($) loan	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) loan
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses at beginning of period	$ 47,137,000	$ 52,323,000	$ 52,323,000
Provision for (release of) current expected credit loss, net	(28,000)	(115,000)
Allowance for credit losses at end of period	47,109,000	52,208,000	47,137,000
Amortized cost basis of loans on non-accrual status	50,707,000		129,679,000
Principal balance of loans on non-accrual status	50,700,000		123,900,000
Total mortgage loan receivables held for investment, net, at amortized cost
Allowance for Loan and Lease Losses [Roll Forward]
Allowance for credit losses at beginning of period	47,137,000	52,323,000	52,323,000
Allowance for credit losses at end of period	47,109,000	52,208,000	47,137,000
Interest income on loans	0		500,000
Asset Specific Reserve, Company Loan
Allowance for Loan and Lease Losses [Roll Forward]
Additional asset-specific reserve	0	$ 0
One loan \| Total mortgage loan receivables held for investment, net, at amortized cost
Allowance for Loan and Lease Losses [Roll Forward]
Amortized cost basis of loans on non-accrual status			$ 4,600,000
Number of nonaccrual loans \| loan			1
One loan \| Total mortgage loan receivables held for investment, net, at amortized cost \| Second Multifamily Loan
Allowance for Loan and Lease Losses [Roll Forward]
Amortized cost basis of loans on non-accrual status	$ 50,700,000		$ 50,700,000
Number of nonaccrual loans \| loan	1		1
One loan \| Total mortgage loan receivables held for investment, net, at amortized cost \| Multifamily Loan
Allowance for Loan and Lease Losses [Roll Forward]
Amortized cost basis of loans on non-accrual status			$ 61,300,000
Number of nonaccrual loans \| loan			1
One loan \| Total mortgage loan receivables held for investment, net, at amortized cost \| Hotel Loan
Allowance for Loan and Lease Losses [Roll Forward]
Amortized cost basis of loans on non-accrual status			$ 11,900,000
Number of nonaccrual loans \| loan			1
One loan \| Total mortgage loan receivables held for investment, net, at amortized cost \| Office Loan
Allowance for Loan and Lease Losses [Roll Forward]
Amortized cost basis of loans on non-accrual status			$ 5,800,000
Number of nonaccrual loans \| loan			1

Ladder Capital Corp 10-Q