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

Serviced Mortgage Assets (Details) $ in Thousands	Sep. 30, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	403,113	285,122
Unpaid Principal Balance \| $	$ 91,776,879	$ 66,112,005
Servicing Contracts [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	398,580	280,185
Unpaid Principal Balance \| $	$ 88,789,765	$ 62,827,975
Loans Held-for-Investment, Residential Mortgages [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	4,288	4,604
Unpaid Principal Balance \| $	$ 2,948,349	$ 3,234,044
Loans Held-for-Sale, Residential Mortgages [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Number of Loans \| loan	245	333
Unpaid Principal Balance \| $	$ 38,765	$ 49,986