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Geographic Distribution of Mortgage Loans Held (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]    
Mortgage loans held 100.00%hts_LoansHeldForSaleMortgagesPercent 100.00%hts_LoansHeldForSaleMortgagesPercent
California    
Schedule Of Available For Sale Securities [Line Items]    
Mortgage loans held 64.00%hts_LoansHeldForSaleMortgagesPercent
/ us-gaap_StatementGeographicalAxis
= stpr_CA		 82.00%hts_LoansHeldForSaleMortgagesPercent
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Washington    
Schedule Of Available For Sale Securities [Line Items]    
Mortgage loans held 9.00%hts_LoansHeldForSaleMortgagesPercent
/ us-gaap_StatementGeographicalAxis
= stpr_WA		 2.00%hts_LoansHeldForSaleMortgagesPercent
/ us-gaap_StatementGeographicalAxis
= stpr_WA
Illinois    
Schedule Of Available For Sale Securities [Line Items]    
Mortgage loans held 8.00%hts_LoansHeldForSaleMortgagesPercent
/ us-gaap_StatementGeographicalAxis
= stpr_IL		 2.00%hts_LoansHeldForSaleMortgagesPercent
/ us-gaap_StatementGeographicalAxis
= stpr_IL
Texas    
Schedule Of Available For Sale Securities [Line Items]    
Mortgage loans held 6.00%hts_LoansHeldForSaleMortgagesPercent
/ us-gaap_StatementGeographicalAxis
= stpr_TX		 3.00%hts_LoansHeldForSaleMortgagesPercent
/ us-gaap_StatementGeographicalAxis
= stpr_TX
All Other    
Schedule Of Available For Sale Securities [Line Items]    
Mortgage loans held 13.00%hts_LoansHeldForSaleMortgagesPercent
/ us-gaap_StatementGeographicalAxis
= hts_OtherStatesMember		 11.00%hts_LoansHeldForSaleMortgagesPercent
/ us-gaap_StatementGeographicalAxis
= hts_OtherStatesMember