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

Commercial Real Estate Loans Held-for-Investment by Property Type (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%
Retail Site [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans held-for-investment	$ 104,159		$ 0
Loans and Leases Receivable, Percentage of Total, Commercial	35.80%		0.00%
Hotel [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans held-for-investment	$ 62,611		$ 0
Loans and Leases Receivable, Percentage of Total, Commercial	21.50%		0.00%
Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans held-for-investment	$ 40,930		$ 0
Loans and Leases Receivable, Percentage of Total, Commercial	14.10%		0.00%
Office Building [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans held-for-investment	$ 83,210		$ 0
Loans and Leases Receivable, Percentage of Total, Commercial	28.60%		0.00%