v3.25.1
Cover
Jun. 05, 2025
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 05, 2025
Entity File Number 001-38124
Entity Registrant Name Granite Point Mortgage Trust Inc.
Entity Central Index Key 0001703644
Entity Tax Identification Number 61-1843143
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One 3 Bryant Park
Entity Address, Address Line Two Suite 2400A
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10036
City Area Code 212
Local Phone Number 364-5500
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, par value $0.01 per share
Trading Symbol GPMT
Security Exchange Name NYSE
7.00% Series A Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock, par value $0.01 per share [Member]  
Document Information [Line Items]  
Title of 12(b) Security 7.00% Series A Fixed-to-Floating Rate Cumulative Redeemable Preferred Stock, par value $0.01 per share
Trading Symbol GPMTPrA
Security Exchange Name NYSE