Loans Held-for-Investment, Net of Allowance for Credit Losses - Schedule of Loans Held-for-Investment (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026 USD ($) loan	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($) loan	Dec. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance	$ 1,514,892		$ 1,689,967
Unamortized net deferred origination fees			(6,323)
Allowance for credit losses	(147,298)	$ (177,282)	(145,912)	$ (199,727)
Loans held-for-investment, net	$ 1,362,799	1,760,377	1,537,732	$ 1,897,648
Unfunded commitments			$ 77,399
Number of loans \| loan	40		43
Weighted average coupon (as a percent)			6.20%
Weighted average years to maturity (in years)			6 months
Realized loss on loan sales	$ (18)	$ 0
Senior Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance	1,514,892		$ 1,677,017
Unamortized net deferred origination fees	(4,795)		(6,323)
Allowance for credit losses	(147,298)		(145,891)
Loans held-for-investment, net	1,362,799		1,524,803
Unfunded commitments	$ 68,005		$ 77,399
Number of loans \| loan	40		42
Weighted average coupon (as a percent)	5.60%		6.20%
Weighted average years to maturity (in years)	6 months		6 months
B-Notes
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance			$ 12,950
Unamortized net deferred origination fees			0
Allowance for credit losses			(21)
Loans held-for-investment, net			12,929
Unfunded commitments			$ 0
Number of loans \| loan			1
Weighted average coupon (as a percent)			8.00%
Weighted average years to maturity (in years)			1 year 1 month 6 days

Granite Point Mortgage Trust Inc. 10-Q