Variable Interest Entities and Securitized Debt Obligations - Schedule of Securitized Debt Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Carrying Value	$ 535,716	$ 643,528
Collateral assets
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Principal Balance	718,056	826,072
Carrying Value	$ 693,349	$ 801,997
Weighted average interest rate of securitized debt obligations outstanding (as a percent)	3.80%	3.70%
Collateral assets \| GPMT 2021-FL4 CRE CLO
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Principal Balance	$ 438,084	$ 464,162
Carrying Value	$ 416,977	$ 446,569
Weighted average interest rate of securitized debt obligations outstanding (as a percent)	3.90%	3.90%
Collateral assets \| GPMT 2021-FL3 CRE CLO
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Principal Balance	$ 279,972	$ 361,910
Carrying Value	$ 276,372	$ 355,428
Weighted average interest rate of securitized debt obligations outstanding (as a percent)	3.70%	3.60%
Financing provided
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Principal Balance	$ 535,751	$ 643,767
Carrying Value	$ 535,716	$ 643,528
Weighted average interest rate of securitized debt obligations outstanding (as a percent)	2.40%	2.30%
Financing provided \| GPMT 2021-FL4 CRE CLO
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Principal Balance	$ 332,115	$ 358,193
Carrying Value	$ 332,080	$ 357,954
Weighted average interest rate of securitized debt obligations outstanding (as a percent)	2.00%	1.90%
Financing provided \| GPMT 2021-FL3 CRE CLO
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Principal Balance	$ 203,636	$ 285,574
Carrying Value	$ 203,636	$ 285,574
Weighted average interest rate of securitized debt obligations outstanding (as a percent)	3.00%	2.70%

Granite Point Mortgage Trust Inc. 10-Q