XML 74 R64.htm IDEA: XBRL DOCUMENT
v3.25.1

MORTGAGE BANKING OPERATIONS - Sensitivity Analysis (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Key economic assumptions and the sensitivity of the current fair value for single family MSRs |  |  |  |
Expected weighted-average life (in years) | 8 years 3 months 21 days |  |  |
CPR |  |  |  |
Impact on fair value of 25 basis points adverse change in interest rates | $ (1,015) |  |  |
Impact on fair value of 50 basis points adverse change in interest rates | (2,122) |  |  |
Discount rate |  |  |  |
Impact on fair value of 100 basis points increase | (2,827) |  |  |
Impact on fair value of 200 basis points increase | (5,628) |  |  |
Single family |  |  |  |
Key economic assumptions and the sensitivity of the current fair value for single family MSRs |  |  |  |
Fair value of single family MSR | $ 72,285 | $ 72,901 | $ 74,056 | $ 74,249

X
- Definition Constant Prepayment Rate + References No definition available. + Details
Name: | hmst_ConstantPrepaymentRateAbstract
Namespace Prefix: | hmst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Discount Rate + References No definition available. + Details
Name: | hmst_DiscountRateAbstract
Namespace Prefix: | hmst_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Impact on fair value of 50 basis points decrease. + References No definition available. + Details
Name: | hmst_ImpactOnFairValueOfFiftyBasisPointsDecrease
Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Impact on fair value of 100 basis points increase. + References No definition available. + Details
Name: | hmst_ImpactOnFairValueOfHundredBasisPointsIncrease
Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Impact on fair value of 25 basis points decrease. + References No definition available. + Details
Name: | hmst_ImpactOnFairValueOfTwentyFiveBasisPointsDecrease
Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Impact on fair value of 200 basis points increase. + References No definition available. + Details
Name: | hmst_ImpactOnFairValueOfTwoHundredBasisPointsIncrease
Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 + Details
Name: | us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-2 + Details
Name: | us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageLife1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |