XML 71 R61.htm IDEA: XBRL DOCUMENT
v3.21.2

MORTGAGE BANKING OPERATIONS - Sensitivity Analysis (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) | Dec. 31, 2020
Key economic assumptions and the sensitivity of the current fair value for single family MSRs |  |
Fair value of single family MSR | $ 59,872 |
Expected weighted-average life (in years) | 5 years 7 months 20 days |
Constant Prepayment Rate [Abstract] |  |
Impact on fair value of 25 basis points adverse change in interest rates | $ (3,366) |
Impact on fair value of 50 basis points adverse change in interest rates | (6,677) |
Discount Rate [Abstract] |  |
Impact on fair value of 100 basis points increase | (2,803) |
Impact on fair value of 200 basis points increase | $ (5,394) |
Minimum | CPRs |  |
Key economic assumptions and the sensitivity of the current fair value for single family MSRs |  |
Measurement input (as a percent) | 0.0880 | 0.0813
Minimum | Discount rate |  |
Key economic assumptions and the sensitivity of the current fair value for single family MSRs |  |
Measurement input (as a percent) | 0.0647 | 0.0650
Maximum | CPRs |  |
Key economic assumptions and the sensitivity of the current fair value for single family MSRs |  |
Measurement input (as a percent) | 0.1773 | 0.1970
Maximum | Discount rate |  |
Key economic assumptions and the sensitivity of the current fair value for single family MSRs |  |
Measurement input (as a percent) | 0.1367 | 0.1314
Weighted average | CPRs |  |
Key economic assumptions and the sensitivity of the current fair value for single family MSRs |  |
Measurement input (as a percent) | 0.1104 | 0.1281
Weighted average | Discount rate |  |
Key economic assumptions and the sensitivity of the current fair value for single family MSRs |  |
Measurement input (as a percent) | 0.0778 | 0.0827

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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
Name: | us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure servicing asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_ServicingAssetMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122596-111746 + Details
Name: | us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageLife1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputConstantPrepaymentRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |