Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Assets:
Cash and cash equivalents	$ 536,834		$ 177,671	$ 144,199	$ 114,027
Restricted cash	82,706		3,429
Loans held-for-investment, net (subject to $95,000 participation liability)	3,790,262		2,914,434
Loans held-for-sale ($279,121 and $0 held at fair value)	345,139
Loans transferred as secured borrowings	85,590		85,901
Investment securities ($529,423 and $884,254 held at fair value)	566,793		884,254
Intangible assets - servicing rights ($158,023 and $0 held at fair value)	187,732
Residential real estate, net	548,022		99,115
Non-performing residential loans	197,716		68,883
Investment in unconsolidated entities	138,168		32,318
Goodwill	107,099
Derivative assets	9,513		9,227
Accrued interest receivable	20,952		24,120
Other assets	98,383		25,021
VIE assets, at fair value	97,359,666
Total Assets	104,074,575		4,324,373
Liabilities:
Accounts payable, accrued expenses and other liabilities	189,172		30,094
Related-party payable	26,788		1,803
Dividends payable	90,130		73,796	51,629
Derivative liabilities	32,252		27,770
Secured financing agreements, net	1,312,044		1,305,812
Convertible senior notes, net	995,072
Loan transfer secured borrowings	86,682		87,893
Loan participation liability	95,000
VIE liabilities, at fair value	96,934,006
Total Liabilities	99,761,146		1,527,168
Commitments and contingencies (Note 23)
Starwood Property Trust, Inc. Stockholders' Equity:
Preferred stock, $0.01 per share, 100,000,000 shares authorized, no shares issued and outstanding
Common stock, $0.01 per share, 500,000,000 shares authorized, 195,887,275 issued and 195,261,425 outstanding as of September 30, 2013 and 136,125,356 issued and 135,499,506 outstanding as of December 31, 2012	1,959		1,361
Additional paid-in capital	4,295,058		2,721,353
Treasury stock (625,850 shares)	(10,642)		(10,642)
Accumulated other comprehensive income	69,287	60,285	79,675
Accumulated deficit	(85,339)		(72,401)
Total Starwood Property Trust, Inc. Stockholders' Equity	4,270,323		2,719,346
Non-controlling interests in consolidated subsidiaries	43,106		77,859
Total Equity	4,313,429		2,797,205	2,301,238	1,765,147
Total Liabilities and Equity	$ 104,074,575		$ 4,324,373