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

Serviced Mortgage Assets (Details) $ in Thousands	Jun. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($) 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	534,354	458,133
Unpaid Principal Balance \| $	$ 122,069,063	$ 104,002,292
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	530,395	454,028
Unpaid Principal Balance \| $	$ 119,531,589	$ 101,344,054
Loans in Securitization Trusts, 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	3,723	3,845
Unpaid Principal Balance \| $	$ 2,500,663	$ 2,618,016
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	215	236
Unpaid Principal Balance \| $	$ 34,965	$ 37,632
Other Assets [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	21	24
Unpaid Principal Balance \| $	$ 1,846	$ 2,590