Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Significant Accounting Policies Consolidation and Basis of Presentation (Details)

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Basis of Presentation and Significant Accounting Policies Consolidation and Basis of Presentation (Details)
Nov. 01, 2017
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Basis of Presentation and Significant Accounting Policies [Abstract]  
Reverse stock split, conversion ratio 0.50
Number of shares of common stock of Granite Point Mortgage Trust Inc distributed via special dividend (in shares) 33,100,000