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Schedule of Agency Securities and MBS Portfolio Includes MBS not Issued or Guaranteed by U.S. Government Agency or U.S. Government Sponsored Entity (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]    
Agency Securities Amortized Cost $ 16,619,098us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 17,354,770us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Loss (9,139)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax (35,531)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Gross Unrealized Gain 315,045us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 267,771us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Carrying value/estimated fair value 16,925,004us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue 17,587,010us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
Agency Securities    
Schedule Of Available For Sale Securities [Line Items]    
Agency Securities Amortized Cost 16,503,014us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_AgencySecuritiesMember		 17,279,316us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_AgencySecuritiesMember
Gross Unrealized Loss (9,139)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_AgencySecuritiesMember		 (35,531)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_AgencySecuritiesMember
Gross Unrealized Gain 313,937us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_AgencySecuritiesMember		 267,623us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_AgencySecuritiesMember
Carrying value/estimated fair value 16,807,812us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_AgencySecuritiesMember		 17,511,408us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_UnderlyingAssetClassAxis
= us-gaap_AgencySecuritiesMember
Non-Agency Securities (ARMs)    
Schedule Of Available For Sale Securities [Line Items]    
Agency Securities Amortized Cost 72,791us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_UnderlyingAssetClassAxis
= hts_NonAgencySecuritiesMember		 75,454us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_UnderlyingAssetClassAxis
= hts_NonAgencySecuritiesMember
Gross Unrealized Loss 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_UnderlyingAssetClassAxis
= hts_NonAgencySecuritiesMember		  
Gross Unrealized Gain 202us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_UnderlyingAssetClassAxis
= hts_NonAgencySecuritiesMember		 148us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_UnderlyingAssetClassAxis
= hts_NonAgencySecuritiesMember
Carrying value/estimated fair value 72,993us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_UnderlyingAssetClassAxis
= hts_NonAgencySecuritiesMember		 75,602us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_UnderlyingAssetClassAxis
= hts_NonAgencySecuritiesMember
GSE CRT Bonds    
Schedule Of Available For Sale Securities [Line Items]    
Agency Securities Amortized Cost 43,293us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_UnderlyingAssetClassAxis
= hts_GSECRTBondsMember		  
Gross Unrealized Loss 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_UnderlyingAssetClassAxis
= hts_GSECRTBondsMember		  
Gross Unrealized Gain 906us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_UnderlyingAssetClassAxis
= hts_GSECRTBondsMember		  
Carrying value/estimated fair value 44,199us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_UnderlyingAssetClassAxis
= hts_GSECRTBondsMember		  
Fannie Mae Certificates    
Schedule Of Available For Sale Securities [Line Items]    
Agency Securities Amortized Cost 9,762,507us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 10,315,029us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Gross Unrealized Loss (2,435)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 (13,737)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Gross Unrealized Gain 214,226us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 189,066us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Carrying value/estimated fair value 9,974,298us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 10,490,358us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Fannie Mae Certificates | Adjustable Rate Residential Mortgage    
Schedule Of Available For Sale Securities [Line Items]    
Agency Securities Amortized Cost 8,707,525us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 9,203,741us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Gross Unrealized Loss (2,435)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 (13,737)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Gross Unrealized Gain 205,411us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 183,889us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Carrying value/estimated fair value 8,910,501us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 9,373,893us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Fannie Mae Certificates | Fixed-Rate    
Schedule Of Available For Sale Securities [Line Items]    
Agency Securities Amortized Cost 1,054,982us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 1,111,288us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Gross Unrealized Loss 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		  
Gross Unrealized Gain 8,815us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 5,177us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Carrying value/estimated fair value 1,063,797us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 1,116,465us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Freddie Mac Certificates    
Schedule Of Available For Sale Securities [Line Items]    
Agency Securities Amortized Cost 6,740,507us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 6,964,287us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Gross Unrealized Loss (6,704)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 (21,794)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Gross Unrealized Gain 99,711us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 78,557us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Carrying value/estimated fair value 6,833,514us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 7,021,050us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Freddie Mac Certificates | Adjustable Rate Residential Mortgage    
Schedule Of Available For Sale Securities [Line Items]    
Agency Securities Amortized Cost 6,589,841us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 6,805,885us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Gross Unrealized Loss (6,704)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 (21,794)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Gross Unrealized Gain 97,288us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 76,790us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Carrying value/estimated fair value 6,680,425us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 6,860,881us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AdjustableRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Freddie Mac Certificates | Fixed-Rate    
Schedule Of Available For Sale Securities [Line Items]    
Agency Securities Amortized Cost 150,666us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 158,402us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Gross Unrealized Loss 0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		  
Gross Unrealized Gain 2,423us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 1,767us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Carrying value/estimated fair value $ 153,089us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 $ 160,169us-gaap_FinancialInstrumentsOwnedMortgagesMortgageBackedAndAssetBackedSecuritiesAtFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FixedRateResidentialMortgageMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember