CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
10% cumulative redeemable preferred stock par value per share (in usd per share)		$ 0.01	$ 0.01
10% cumulative redeemable preferred shares authorized (in shares)		50,000,000	50,000,000
10% cumulative redeemable preferred shares issued (in shares)		1,000	1,000
10% cumulative redeemable preferred shares outstanding (in shares)		1,000	1,000
Common stock par value per share (in usd per share)		$ 0.01	$ 0.01
Common shares authorized (in shares)		450,000,000	450,000,000
Common shares issued (in shares)		55,205,082	54,853,205
Common shares outstanding (in shares)		55,205,082	54,853,205
Assets of consolidated Variable Interest Entities	[1]	$ 4,402,852	$ 4,460,862
Liabilities of consolidated Variable Interest Entities	[1]	3,467,390	3,440,726
Variable Interest Entity, Primary Beneficiary | Assets, Total
Variable Interest Entity [Line Items]
Assets of consolidated Variable Interest Entities		1,252,969	1,387,148
Variable Interest Entity, Primary Beneficiary | Liabilities, Total
Variable Interest Entity [Line Items]
Liabilities of consolidated Variable Interest Entities		$ 930,066	$ 1,042,122

[1] The condensed consolidated balance sheets include assets of consolidated variable interest entities, or VIEs, that can only be used to settle obligations of these VIEs, and liabilities of the consolidated VIEs for which creditors do not have recourse to Granite Point Mortgage Trust Inc. At September 30, 2020 and December 31, 2019, assets of the VIEs totaled $1,252,969 and $1,387,148, respectively, and liabilities of the VIEs totaled $930,066 and $1,042,122, respectively. See Note 3 - Variable Interest Entities for additional information.