Annual report pursuant to Section 13 and 15(d)

Schedule of Repurchase Agreements by Term, Short or Long (Details)

v2.4.1.9
Schedule of Repurchase Agreements by Term, Short or Long (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements $ 12,932,463us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability $ 12,250,450us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
Maturity up to One Year [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements 12,839,242us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= two_MaturityuptoOneYearMember 		12,050,450us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= two_MaturityuptoOneYearMember
Maturity Over One Year [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements $ 93,221us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= two_MaturityOverOneYearMember 		$ 200,000us-gaap_AssetsSoldUnderAgreementsToRepurchaseRepurchaseLiability
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis
= two_MaturityOverOneYearMember