Two Harbors Investment Corp. Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with Borrowings (Details)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with Borrowings (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative, Notional Amount	$ 48,115,523invest_DerivativeNotionalAmount	$ 37,366,610invest_DerivativeNotionalAmount	$ 22,377,656invest_DerivativeNotionalAmount
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	18,584,000	19,619,000	14,070,000
Interest Rate Swap [Member] \| Interest Rate Risk Associated with Borrowings [Member]
Derivative [Line Items]
Derivative, Notional Amount	11,490,000	14,425,000
Derivative, Average Fixed Interest Rate	1.089%	0.698%
Derivative, Average Variable Interest Rate	0.246%	0.235%
Derivative, Average Remaining Period Until Maturity	2.92	2.50
Interest Rate Swap [Member] \| Interest Rate Risk Associated with Borrowings [Member] \| Derivative Maturity Within One Year From Balance Sheet Date [Member]
Derivative [Line Items]
Derivative, Notional Amount		3,900,000
Derivative, Average Fixed Interest Rate		0.30%
Derivative, Average Variable Interest Rate		0.245%
Derivative, Average Remaining Period Until Maturity		0.76
Interest Rate Swap [Member] \| Interest Rate Risk Associated with Borrowings [Member] \| Derivative Maturity Over One And Within Two Years From Balance Sheet Date [Member]
Derivative [Line Items]
Derivative, Notional Amount	4,100,000	1,000,000
Derivative, Average Fixed Interest Rate	0.667%	0.383%
Derivative, Average Variable Interest Rate	0.249%	0.244%
Derivative, Average Remaining Period Until Maturity	1.65	1.04
Interest Rate Swap [Member] \| Interest Rate Risk Associated with Borrowings [Member] \| Derivative Maturity Over Two And Within Three Years From Balance Sheet Date [Member]
Derivative [Line Items]
Derivative, Notional Amount	5,285,000	2,950,000
Derivative, Average Fixed Interest Rate	1.063%	0.626%
Derivative, Average Variable Interest Rate	0.248%	0.246%
Derivative, Average Remaining Period Until Maturity	2.55	2.42
Interest Rate Swap [Member] \| Interest Rate Risk Associated with Borrowings [Member] \| Derivative Maturity Over Three And Within Four Years From Balance Sheet Date [Member]
Derivative [Line Items]
Derivative, Notional Amount	625,000	5,300,000
Derivative, Average Fixed Interest Rate	0.945%	0.92%
Derivative, Average Variable Interest Rate	0.233%	0.217%
Derivative, Average Remaining Period Until Maturity	3.08	3.49
Interest Rate Swap [Member] \| Interest Rate Risk Associated with Borrowings [Member] \| Derivative Maturity Over Four Years From Balance Sheet Date [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 1,480,000	$ 1,275,000
Derivative, Average Fixed Interest Rate	2.408%	1.406%
Derivative, Average Variable Interest Rate	0.235%	0.242%
Derivative, Average Remaining Period Until Maturity	7.70	5.04