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Schedule of Mortgage Backed Securities (Details) (TBA Dollar Roll, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
TBA Dollar Roll
    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
TBA dollar roll securities - Face $ 3,400,000hts_DerivativeInstrumentsFaceAmount
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_DollarRollsMember		 $ 600,000hts_DerivativeInstrumentsFaceAmount
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_DollarRollsMember
TBA dollar roll securities - Cost 3,509,871hts_DerivativeInstrumentsCost
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_DollarRollsMember		 632,270hts_DerivativeInstrumentsCost
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_DollarRollsMember
TBA dollar roll securities - Fair Market Value 3,521,816hts_DerivativeInstrumentsFairMarketValue
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_DollarRollsMember		 627,187hts_DerivativeInstrumentsFairMarketValue
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_DollarRollsMember
TBA dollar roll securities - Net Asset (Liability) $ 11,945us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_DollarRollsMember		 $ (5,083)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_DollarRollsMember