Two Harbors Investment Corp. 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
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional	$ 19,137,094,000	$ 60,549,307,000	$ 23,932,603,000	$ 48,445,497,000
Interest Rate Swap [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 11,394,818,000		$ 11,194,818,000
Weighted Average Fixed Interest Rate	0.085%		0.067%
Weighted Average Variable Interest Rate	0.063%		0.09%
Weighted Average Remaining Maturity	2 years 4 months 9 days	2 years 5 months 19 days
Interest Rate Swap [Member] \| Derivative Maturity Within One Year From Balance Sheet Date [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 0		$ 0
Weighted Average Fixed Interest Rate	0.00%		0.00%
Weighted Average Variable Interest Rate	0.00%		0.00%
Weighted Average Remaining Maturity	0 years	0 years
Interest Rate Swap [Member] \| Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 7,415,818,000		$ 7,415,818,000
Weighted Average Fixed Interest Rate	0.042%		0.042%
Weighted Average Variable Interest Rate	0.06%		0.09%
Weighted Average Remaining Maturity	1 year 4 months 28 days	1 year 7 months 28 days
Interest Rate Swap [Member] \| Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 2,281,500,000		$ 2,281,500,000
Weighted Average Fixed Interest Rate	0.023%		0.023%
Weighted Average Variable Interest Rate	0.06%		0.09%
Weighted Average Remaining Maturity	2 years 2 months 23 days	2 years 5 months 23 days
Interest Rate Swap [Member] \| Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 0		$ 0
Weighted Average Fixed Interest Rate	0.00%		0.00%
Weighted Average Variable Interest Rate	0.00%		0.00%
Weighted Average Remaining Maturity	0 years	0 years
Interest Rate Swap [Member] \| Derivative Maturity Over Four Years From Balance Sheet Date [Member] \| Long [Member]
Derivative [Line Items]
Notional	$ 1,697,500,000		$ 1,497,500,000
Weighted Average Fixed Interest Rate	0.358%		0.257%
Weighted Average Variable Interest Rate	0.079%		0.09%
Weighted Average Remaining Maturity	6 years 7 months 28 days	6 years 5 months 26 days