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INVESTMENT SECURITIES - Pledged to Secure Borrowings and Public Deposits (Details) - Asset Pledged as Collateral without Right - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Total securities pledged as collateral | $ 200,284 | $ 211,411
Deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Washington, Oregon and California to secure public deposits | 195,497 | 206,153
Notes Payable, Other Payables |  |
Debt Securities, Available-for-sale [Line Items] |  |
Other securities pledged | $ 4,787 | $ 5,258

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- Definition Pledged Assets Not Separately Reported Securities Pledged For State and Local Governments. + References No definition available. + Details
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Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Pledged Assets Separately Reported Other Securities Pledged + References No definition available. + Details
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Namespace Prefix: | hmst_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |