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LOANS AND CREDIT QUALITY - Loan Modifications with Subsequent Default, by Loan Modification (Details) - Consumer Loan - Single family - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Significant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loan modifications with subsequent default	$ 0	$ 0
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loan modifications with subsequent default	0	0
Interest Rate Reduction and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loan modifications with subsequent default	0	0
Significant Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loan modifications with subsequent default	0	172
Interest Rate Reduction, Significant Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loan modifications with subsequent default	$ 553	$ 1,555

X

- Definition

Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default

+ References

No definition available.

+ Details

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Namespace Prefix:	hmst_
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Balance Type:	debit
Period Type:	duration

X

- 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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X

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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