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Commitments Guarantees and Contingencies (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]        
Credit of Unfunded Commitments $ 64,500,000hmst_CreditOfUnfundedCommitments   $ 72,000,000hmst_CreditOfUnfundedCommitments  
Loans serviced for others 12,766,920,000us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding   12,051,202,000us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding  
Representations and Warranties Reserve for Loan Receivables [Member]        
Loss Contingencies [Line Items]        
Guarantor Obligations, Maximum Exposure, Undiscounted (11,990,000,000)us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hmst_RepresentationsAndWarrantiesReserveForLoanReceivablesMember
  (11,300,000,000)us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hmst_RepresentationsAndWarrantiesReserveForLoanReceivablesMember
 
Loss Contingency Accrual, at Carrying Value 2,111,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hmst_RepresentationsAndWarrantiesReserveForLoanReceivablesMember
1,142,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hmst_RepresentationsAndWarrantiesReserveForLoanReceivablesMember
1,956,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hmst_RepresentationsAndWarrantiesReserveForLoanReceivablesMember
1,260,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hmst_RepresentationsAndWarrantiesReserveForLoanReceivablesMember
Loss Contingency Accrual, Carrying Value, Provision 487,000us-gaap_LossContingencyAccrualProvision
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hmst_RepresentationsAndWarrantiesReserveForLoanReceivablesMember
[1] 239,000us-gaap_LossContingencyAccrualProvision
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hmst_RepresentationsAndWarrantiesReserveForLoanReceivablesMember
[1]    
Loss Contingency Accrual, Carrying Value, Payments 332,000us-gaap_LossContingencyAccrualCarryingValuePayments
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hmst_RepresentationsAndWarrantiesReserveForLoanReceivablesMember
[2] 357,000us-gaap_LossContingencyAccrualCarryingValuePayments
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hmst_RepresentationsAndWarrantiesReserveForLoanReceivablesMember
[2]    
Legal Reserve [Member]        
Loss Contingencies [Line Items]        
Loss Contingency Accrual, at Carrying Value 0us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_LegalReserveMember
     
Home Equity and Business Banking Credit Lines [Member]        
Loss Contingencies [Line Items]        
Guarantor Obligations, Maximum Exposure, Undiscounted (141,700,000)us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= hmst_HomeEquityAndBusinessBankingCreditLinesMember
  (149,400,000)us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= hmst_HomeEquityAndBusinessBankingCreditLinesMember
 
Undisbursed construction loan funds [Member]        
Loss Contingencies [Line Items]        
Guarantor Obligations, Maximum Exposure, Undiscounted (392,900,000)us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= hmst_UndisbursedConstructionLoanFundsMember
  (379,400,000)us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= hmst_UndisbursedConstructionLoanFundsMember
 
Credit Risk [Member]        
Loss Contingencies [Line Items]        
Loss Contingency Accrual, at Carrying Value 712,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CreditRiskMember
190,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CreditRiskMember
503,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_CreditRiskMember
 
Multifamily Residential [Member] | Loss Sharing Relationship [Member]        
Loss Contingencies [Line Items]        
Loss Contingency Accrual, at Carrying Value 2,300,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_FinancialInstrumentAxis
= hmst_MultifamilyResidentialMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= hmst_LossSharingRelationshipMember
  2,300,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_FinancialInstrumentAxis
= hmst_MultifamilyResidentialMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= hmst_LossSharingRelationshipMember
 
Loss Contingency, Loss in Period 0us-gaap_LossContingencyLossInPeriod
/ us-gaap_FinancialInstrumentAxis
= hmst_MultifamilyResidentialMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= hmst_LossSharingRelationshipMember
0us-gaap_LossContingencyLossInPeriod
/ us-gaap_FinancialInstrumentAxis
= hmst_MultifamilyResidentialMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= hmst_LossSharingRelationshipMember
   
Loans serviced for others $ 773,100,000us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= hmst_MultifamilyResidentialMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= hmst_LossSharingRelationshipMember
  $ 752,600,000us-gaap_ContinuingInvolvementWithTransferredFinancialAssetsPrincipalAmountOutstanding
/ us-gaap_FinancialInstrumentAxis
= hmst_MultifamilyResidentialMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= hmst_LossSharingRelationshipMember
 
Minimum [Member]        
Loss Contingencies [Line Items]        
Percentage of Loss that Lender is Responsible For on Loans Sold under Loss Sharing Agreement 5.00%hmst_PercentageofLossthatLenderisResponsibleForonLoansSoldunderLossSharingAgreement
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Maximum [Member]        
Loss Contingencies [Line Items]        
Percentage of Loss that Lender is Responsible For on Loans Sold under Loss Sharing Agreement 20.00%hmst_PercentageofLossthatLenderisResponsibleForonLoansSoldunderLossSharingAgreement
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
[1] Includes additions for new loan sales and changes in estimated probable future repurchase losses on previously sold loans.
[2] Includes principal losses and accrued interest on repurchased loans, “make-whole” settlements, settlements with claimants and certain related expense.