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Schedule of ARM Securities Forward Purchase Commitments with Brokers (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]  
Forward purchase agreements - Face $ 20,095hts_ToBeAnnouncedSecuritiesFaceAmount
Forward purchase agreements - Cost 20,553hts_ToBeAnnouncedSecuritiesCost
Forward purchase agreements - Fair Value 20,517hts_ToBeAnnouncedSecuritiesFairMarketValue
Forward purchase agreements - Net Asset (Liability) $ (36)hts_ToBeAnnouncedSecuritiesNetAssetLiability