Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events Proposed Acquisition of CYS Investments, Inc. (Details)

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Subsequent Events Proposed Acquisition of CYS Investments, Inc. (Details) - Subsequent Event [Member]
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Subsequent Event [Line Items]  
Aggregate Cash Consideration to be Exchanged for Shares of CYS Common Stock $ 15.0
Percentage of CYS Investments' Adjusted Book Value Used to Determine Exchange Ratio 96.75%
Percentage of Two Harbors Adjusted Book Value Used to Determine Exchange Ratio 94.20%