Quarterly report pursuant to Section 13 or 15(d)

Schedule of Related Party Transactions, by Related Party (Details)

v3.10.0.1
Schedule of Related Party Transactions, by Related Party (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Management fees $ 11,453 $ 9,847 $ 23,161 $ 19,655  
Compensation costs related to restricted common stock 4,100 4,300 6,400 8,200  
Equity securities, at fair value 30,425   30,425   $ 29,413
PRCM Advisers LLC [Member]          
Related Party Transaction [Line Items]          
Management fees 11,453 9,847 $ 23,161 19,654  
Percent per annum of equity used to calculate management fees     1.50%    
Direct and allocated costs incurred by manager 3,973 $ 4,035 $ 10,765 $ 8,262  
Granite Point Mortgage Trust Inc. [Member]          
Related Party Transaction [Line Items]          
Purchases of equity securities of related party (in shares)     1,658,008    
Purchases of equity securities of related party     $ 30,049    
Equity securities, at fair value 30,424   30,424   29,413
Equity securities, unrealized gain (loss) $ 371   $ 371   $ (641)