Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan Granite Point Mortgage Trust Inc. Equity Incentive Plan (Details)

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Equity Incentive Plan Granite Point Mortgage Trust Inc. Equity Incentive Plan (Details) - Granite Point Mortgage Trust Inc. 2017 Equity Incentive Plan [Member]
3 Months Ended
Jun. 30, 2017
shares
Director [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of restricted common shares granted during period under equity incentive plan (in shares) 13,205
Key Employees [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of restricted common shares granted during period under equity incentive plan (in shares) 150,000