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

Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Payers (Details)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swap Payers (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional	$ 58,777,783,000	$ 36,528,169,000	$ 18,429,288,000	$ 31,226,878,000
Interest Rate Swap [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 27,853,606,000	$ 21,406,167,000
Weighted Average Variable Interest Rate	2.694%	2.651%
Weighted Average Remaining Maturity	3 years 3 months 21 days	3 years 9 months
Weighted Average Fixed Interest Rate	2.147%	1.978%
Interest Rate Swap [Member] \| Derivative Maturity Within One Year From Balance Sheet Date [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 4,236,897,000	$ 4,336,897,000
Weighted Average Variable Interest Rate	2.716%	2.565%
Weighted Average Remaining Maturity	16 days	24 days
Weighted Average Fixed Interest Rate	1.781%	1.769%
Interest Rate Swap [Member] \| Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 3,640,000,000	$ 3,640,000,000
Weighted Average Variable Interest Rate	2.674%	2.689%
Weighted Average Remaining Maturity	1 year 6 months 29 days	1 year 9 months 29 days
Weighted Average Fixed Interest Rate	1.806%	1.806%
Interest Rate Swap [Member] \| Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 9,156,400,000	$ 4,117,000,000
Weighted Average Variable Interest Rate	2.683%	2.687%
Weighted Average Remaining Maturity	2 years 1 month 13 days	2 years 8 months 8 days
Weighted Average Fixed Interest Rate	2.138%	1.55%
Interest Rate Swap [Member] \| Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 2,470,000,000	$ 2,470,000,000
Weighted Average Variable Interest Rate	2.654%	2.728%
Weighted Average Remaining Maturity	3 years 6 months	3 years 9 months
Weighted Average Fixed Interest Rate	2.002%	2.002%
Interest Rate Swap [Member] \| Derivative Maturity Over Four Years From Balance Sheet Date [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 8,350,309,000	$ 6,842,270,000
Weighted Average Variable Interest Rate	2.716%	2.636%
Weighted Average Remaining Maturity	6 years 8 months 15 days	7 years 7 months 6 days
Weighted Average Fixed Interest Rate	2.533%	2.495%
Forward Starting Interest Rate Swap [Member]
Derivative [Line Items]
Notional		$ 572,000,000.0
Weighted Average Fixed Interest Rate		2.80%