Two Harbors Investment Corp. Quarterly report pursuant to Section 13 or 15(d)

Commercial Real Estate Loans Held-for-Investment by Geographic Location (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans held-for-investment	$ 290,910	$ 45,605	$ 0	$ 0	$ 0	$ 0
Loans and Leases Receivable, Percentage of Total, Commercial	100.00%		0.00%
United States, Western Region [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans held-for-investment	$ 132,158		$ 0
Loans and Leases Receivable, Percentage of Total, Commercial	45.40%		0.00%
United States, Southeastern Region [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans held-for-investment	$ 78,302		$ 0
Loans and Leases Receivable, Percentage of Total, Commercial	26.90%		0.00%
United States, Northeastern Region [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans held-for-investment	$ 48,528		$ 0
Loans and Leases Receivable, Percentage of Total, Commercial	16.70%		0.00%
United States, Midwestern Region [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans held-for-investment	$ 31,922		$ 0
Loans and Leases Receivable, Percentage of Total, Commercial	11.00%		0.00%