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Mortgage Banking Operations (Loans serviced for others)(Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loans serviced for others    
Loans serviced for others $ 12,766,920us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding $ 12,051,202us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
Single Family Residential [Member]    
Loans serviced for others    
Loans serviced for others 11,910,254us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hmst_SingleFamilyResidentialMember		 11,216,208us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hmst_SingleFamilyResidentialMember
Commercial Portfolio Segment [Member]    
Loans serviced for others    
Loans serviced for others 856,666us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 834,994us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
U.S. Government Agency Securities [Member] | Single Family Residential [Member]    
Loans serviced for others    
Loans serviced for others 11,275,491us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AgencySecuritiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hmst_SingleFamilyResidentialMember		 10,630,864us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= us-gaap_AgencySecuritiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hmst_SingleFamilyResidentialMember
Single Family Residential Mortgage Loans, Excluding U.S. Government Agency Mortgage Backed Securities [Member] | Single Family Residential [Member]    
Loans serviced for others    
Loans serviced for others 634,763us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= hmst_SingleFamilyResidentialMortgageLoansExcludingUSGovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hmst_SingleFamilyResidentialMember		 585,344us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= hmst_SingleFamilyResidentialMortgageLoansExcludingUSGovernmentAgencyMortgageBackedSecuritiesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hmst_SingleFamilyResidentialMember
Multifamily Residential [Member] | Commercial Portfolio Segment [Member]    
Loans serviced for others    
Loans serviced for others 773,092us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= hmst_MultifamilyResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 752,640us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= hmst_MultifamilyResidentialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Mortgages, Excluding Multfamily [Member] | Commercial Portfolio Segment [Member]    
Loans serviced for others    
Loans serviced for others $ 83,574us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= hmst_CommercialMortgagesExcludingMultfamilyMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 $ 82,354us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= hmst_CommercialMortgagesExcludingMultfamilyMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember