Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income from loans and other investments
Interest and related income	$ 2,037,621	$ 1,338,954	$ 854,690
Less: Interest and related expenses	1,366,956	710,904	340,223
Income from loans and other investments, net	670,665	628,050	514,467
Other expenses
Management and incentive fees	119,089	110,292	88,467
General and administrative expenses	51,143	52,193	43,168
Total other expenses	170,232	162,485	131,635
(Increase) decrease in current expected credit loss reserve	(249,790)	(211,505)	39,864
Gain on extinguishment of debt	4,616	0	0
Income before income taxes	255,259	254,060	422,696
Income tax provision	5,362	3,003	423
Net income	249,897	251,057	422,273
Net income attributable to non-controlling interests	(3,342)	(2,415)	(3,080)
Net income attributable to Blackstone Mortgage Trust, Inc.	$ 246,555	$ 248,642	$ 419,193
Net income per share of common stock - basic (in dollars per share)	$ 1.43	$ 1.46	$ 2.77
Net income per share of common stock - diluted (in dollars per share)	$ 1.43	$ 1.46	$ 2.77
Weighted-average shares of common stock outstanding, basic and diluted
Basic (in shares)	172,672,038	170,631,410	151,521,941
Diluted (in shares)	172,672,038	170,631,410	151,521,941