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Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements $ 12,932,463us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability $ 12,250,450us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
Number of Repurchase Agreement Counterparties with Whom Repurchase Agreements Are Less Than 10 Percent of Stockholders' Equity 23two_NumberOfRepurchaseAgreementCounterpartiesLessThan10PercentOfStockholdersEquity 18two_NumberOfRepurchaseAgreementCounterpartiesLessThan10PercentOfStockholdersEquity
Maturity on Demand [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements 997,500us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOnDemandMember
997,500us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= us-gaap_MaturityOnDemandMember
Repurchase Agreement Counterparty, Barclays Capital [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements 1,346,085us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyBarclaysCapitalMember
1,453,396us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyBarclaysCapitalMember
Repurchase Agreement Counterparty, Amount at Risk 365,879us-gaap_RepurchaseAgreementCounterpartyAmountAtRisk
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyBarclaysCapitalMember
302,744us-gaap_RepurchaseAgreementCounterpartyAmountAtRisk
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyBarclaysCapitalMember
Repurchase Agreement Counterparty, Percent of Equity at Risk 9.00%two_RepurchaseAgreementCounterpartyPercentOfEquityAtRisk
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyBarclaysCapitalMember
8.00%two_RepurchaseAgreementCounterpartyPercentOfEquityAtRisk
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyBarclaysCapitalMember
Repurchase Agreement Counterparty, Weighted Average Days to Maturity 50.5two_RepurchaseAgreementCounterpartyWeightedAverageDaystoMaturity
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyBarclaysCapitalMember
74.6two_RepurchaseAgreementCounterpartyWeightedAverageDaystoMaturity
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyBarclaysCapitalMember
Repurchase Agreement Counterparty, All Other Counterparties [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements 9,215,329us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyAllOtherCounterpartiesMember
8,819,090us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyAllOtherCounterpartiesMember
Repurchase Agreement Counterparty, Amount at Risk 907,066us-gaap_RepurchaseAgreementCounterpartyAmountAtRisk
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyAllOtherCounterpartiesMember
1,107,340us-gaap_RepurchaseAgreementCounterpartyAmountAtRisk
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyAllOtherCounterpartiesMember
Repurchase Agreement Counterparty, Percent of Equity at Risk 22.00%two_RepurchaseAgreementCounterpartyPercentOfEquityAtRisk
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyAllOtherCounterpartiesMember
29.00%two_RepurchaseAgreementCounterpartyPercentOfEquityAtRisk
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyAllOtherCounterpartiesMember
Repurchase Agreement Counterparty, Weighted Average Days to Maturity 57.7two_RepurchaseAgreementCounterpartyWeightedAverageDaystoMaturity
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyAllOtherCounterpartiesMember
71.2two_RepurchaseAgreementCounterpartyWeightedAverageDaystoMaturity
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyAllOtherCounterpartiesMember
Repurchase Agreement Counterparty, Excluding Repurchase Agreements with Rolling One-Day Maturity [Member]    
Repurchase Agreement Counterparty [Line Items]    
Repurchase agreements 11,934,963us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyExcludingRepurchaseAgreementswithRollingOneDayMaturityMember
11,252,950us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyExcludingRepurchaseAgreementswithRollingOneDayMaturityMember
Repurchase Agreement Counterparty, Amount at Risk $ 1,674,139us-gaap_RepurchaseAgreementCounterpartyAmountAtRisk
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyExcludingRepurchaseAgreementswithRollingOneDayMaturityMember
$ 1,674,830us-gaap_RepurchaseAgreementCounterpartyAmountAtRisk
/ us-gaap_CounterpartyNameAxis
= two_RepurchaseAgreementCounterpartyExcludingRepurchaseAgreementswithRollingOneDayMaturityMember