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LOANS AND CREDIT QUALITY - Loans Credit Quality by Year and Type (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	$ 273,487	$ 2,544,193
Financing receivable, year two	2,520,561	1,797,256
Financing receivable, year three	1,781,268	875,008
Financing receivable, year four	767,209	533,369
Financing receivable, year five	465,962	255,162
Financing receivable, prior to year five	924,665	814,005
Revolving	681,941	599,278
Revolving-term	7,811	8,049
Total LHFI	7,422,904	7,426,320
Fair Value, Recurring
Financing Receivable, Credit Quality Indicator [Line Items]
Single family LHFI	1,280	5,868
Fair Value, Recurring | Level 3
Financing Receivable, Credit Quality Indicator [Line Items]
Single family LHFI	1,280	5,868
30-59 days
Financing Receivable, Credit Quality Indicator [Line Items]
Total LHFI	6,148	4,823
60-89 days
Financing Receivable, Credit Quality Indicator [Line Items]
Total LHFI	4,133	2,020
90+ days
Financing Receivable, Credit Quality Indicator [Line Items]
Total LHFI	4,261	4,372
Commercial and industrial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	244,302	2,266,245
Financing receivable, year two	2,163,372	1,542,597
Financing receivable, year three	1,467,091	722,015
Financing receivable, year four	619,905	483,627
Financing receivable, year five	416,790	210,966
Financing receivable, prior to year five	674,608	577,415
Revolving	310,096	257,715
Revolving-term	2,160	4,032
Total LHFI	5,898,324	6,064,612
Commercial and industrial loans | Non-owner occupied CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	1,499	68,301
Financing receivable, year two	70,388	68,356
Financing receivable, year three	71,217	42,181
Financing receivable, year four	41,235	139,760
Financing receivable, year five	135,816	89,899
Financing receivable, prior to year five	320,556	246,786
Revolving	1,174	2,016
Revolving-term	0	786
Total LHFI	641,885	658,085
Commercial and industrial loans | Non-owner occupied CRE | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	1,499	68,301
Financing receivable, year two	70,388	68,356
Financing receivable, year three	71,217	42,181
Financing receivable, year four	41,235	139,760
Financing receivable, year five	118,900	87,197
Financing receivable, prior to year five	286,379	242,544
Revolving	601	2,016
Revolving-term	0	786
Total LHFI	590,219	651,141
Commercial and industrial loans | Non-owner occupied CRE | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	686	2,702
Financing receivable, prior to year five	34,177	4,242
Revolving	0	0
Revolving-term	0	0
Total LHFI	34,863	6,944
Commercial and industrial loans | Non-owner occupied CRE | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	16,230	0
Financing receivable, prior to year five	0	0
Revolving	573	0
Revolving-term	0	0
Total LHFI	16,803	0
Commercial and industrial loans | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	108,274	1,828,568
Financing receivable, year two	1,813,647	1,165,434
Financing receivable, year three	1,155,619	532,970
Financing receivable, year four	488,595	241,808
Financing receivable, year five	191,935	59,340
Financing receivable, prior to year five	182,119	147,634
Revolving	0	0
Revolving-term	0	0
Total LHFI	3,940,189	3,975,754
Commercial and industrial loans | Multifamily | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	108,274	1,828,568
Financing receivable, year two	1,813,647	1,165,434
Financing receivable, year three	1,151,677	528,077
Financing receivable, year four	475,708	221,974
Financing receivable, year five	189,567	59,340
Financing receivable, prior to year five	177,712	140,126
Revolving	0	0
Revolving-term	0	0
Total LHFI	3,916,585	3,943,519
Commercial and industrial loans | Multifamily | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	3,942	4,893
Financing receivable, year four	12,887	19,834
Financing receivable, year five	2,368	0
Financing receivable, prior to year five	1,344	7,508
Revolving	0	0
Revolving-term	0	0
Total LHFI	20,541	32,235
Commercial and industrial loans | Multifamily | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	3,063	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	3,063	0
Commercial and industrial loans | Multifamily construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one		18,110
Financing receivable, year two	56,013	63,394
Financing receivable, year three	112,234	13,613
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	168,049	95,117
Commercial and industrial loans | Multifamily construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one		18,110
Financing receivable, year two	56,013	63,394
Financing receivable, year three	112,234	13,613
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	168,049	95,117
Commercial and industrial loans | Multifamily construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one		0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	0	0
Commercial and industrial loans | Multifamily construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one		0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	0	0
Commercial and industrial loans | Multifamily construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	(198)
Commercial and industrial loans | Multifamily construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	(198)
Commercial and industrial loans | Multifamily construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0
Commercial and industrial loans | Multifamily construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0
Commercial and industrial loans | CRE construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	7	341
Financing receivable, year two	0	14,348
Financing receivable, year three	14,685	3,960
Financing receivable, year four	3,821	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	305
Revolving	0	0
Revolving-term	0	0
Total LHFI	18,513	18,954
Commercial and industrial loans | CRE construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	7	341
Financing receivable, year two	0	14,348
Financing receivable, year three	14,685	3,960
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	305
Revolving	0	0
Revolving-term	0	0
Total LHFI	14,692	18,954
Commercial and industrial loans | CRE construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	0	0
Commercial and industrial loans | CRE construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	3,821	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	3,821	0
Commercial and industrial loans | Single family construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	75,305	149,133
Financing receivable, year two	39,621	57,718
Financing receivable, year three	12,294	24,807
Financing receivable, year four	0	519
Financing receivable, year five	0	0
Financing receivable, prior to year five	72	74
Revolving	146,758	123,303
Revolving-term	0	0
Total LHFI	274,050	355,554
Commercial and industrial loans | Single family construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	75,305	149,133
Financing receivable, year two	39,621	50,936
Financing receivable, year three	12,294	24,807
Financing receivable, year four	0	519
Financing receivable, year five	0	0
Financing receivable, prior to year five	72	74
Revolving	146,758	123,303
Revolving-term	0	0
Total LHFI	274,050	348,772
Commercial and industrial loans | Single family construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	0	0
Commercial and industrial loans | Single family construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	6,782
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	0	6,782
Commercial and industrial loans | Single family construction to permanent
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	27,114	66,034
Financing receivable, year two	56,469	76,814
Financing receivable, year three	19,871	11,128
Financing receivable, year four	1,850	3,268
Financing receivable, year five	0	794
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	105,304	158,038
Commercial and industrial loans | Single family construction to permanent | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	27,114	66,034
Financing receivable, year two	56,469	76,814
Financing receivable, year three	19,871	11,128
Financing receivable, year four	1,850	3,268
Financing receivable, year five	0	794
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	105,304	158,038
Commercial and industrial loans | Single family construction to permanent | 30-59 days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	0	0
Commercial and industrial loans | Single family construction to permanent | 60-89 days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	0	0
Commercial and industrial loans | Single family construction to permanent | 90+ days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total LHFI	0	0
Commercial and industrial loans | Owner occupied CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	14,331	70,192
Financing receivable, year two	69,877	52,662
Financing receivable, year three	48,919	44,778
Financing receivable, year four	43,399	71,652
Financing receivable, year five	68,601	44,785
Financing receivable, prior to year five	145,034	158,187
Revolving	2	3
Revolving-term	1,122	1,104
Total LHFI	391,285	443,363
Commercial and industrial loans | Owner occupied CRE | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	12,459	70,192
Financing receivable, year two	68,399	51,919
Financing receivable, year three	39,629	44,778
Financing receivable, year four	43,399	71,652
Financing receivable, year five	65,392	36,457
Financing receivable, prior to year five	111,199	139,691
Revolving	2	3
Revolving-term	1,122	1,104
Total LHFI	341,601	415,796
Commercial and industrial loans | Owner occupied CRE | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	1,871	0
Financing receivable, year two	1,478	743
Financing receivable, year three	9,290	0
Financing receivable, year four	0	0
Financing receivable, year five	2,956	6,179
Financing receivable, prior to year five	28,784	13,485
Revolving	0	0
Revolving-term	0	0
Total LHFI	44,379	20,407
Commercial and industrial loans | Owner occupied CRE | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	1	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	253	2,149
Financing receivable, prior to year five	5,051	5,011
Revolving	0	0
Revolving-term	0	0
Total LHFI	5,305	7,160
Commercial and industrial loans | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	17,970	65,566
Financing receivable, year two	57,357	43,871
Financing receivable, year three	32,252	48,578
Financing receivable, year four	41,005	26,620
Financing receivable, year five	20,438	16,148
Financing receivable, prior to year five	26,827	24,429
Revolving	162,162	132,393
Revolving-term	1,038	2,142
Total LHFI	359,049	359,747
Commercial and industrial loans | Commercial business | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	17,970	65,566
Financing receivable, year two	45,892	42,921
Financing receivable, year three	27,227	45,940
Financing receivable, year four	33,404	18,594
Financing receivable, year five	16,198	13,548
Financing receivable, prior to year five	24,903	18,779
Revolving	157,656	130,427
Revolving-term	973	2,041
Total LHFI	324,223	337,816
Commercial and industrial loans | Commercial business | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	11,465	612
Financing receivable, year three	2,891	0
Financing receivable, year four	0	3,577
Financing receivable, year five	452	9
Financing receivable, prior to year five	38	3,444
Revolving	3,485	403
Revolving-term	0	0
Total LHFI	18,331	8,045
Commercial and industrial loans | Commercial business | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	338
Financing receivable, year three	2,134	2,638
Financing receivable, year four	7,601	4,449
Financing receivable, year five	3,788	2,591
Financing receivable, prior to year five	1,886	2,206
Revolving	1,021	1,563
Revolving-term	65	101
Total LHFI	16,495	13,886
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	29,185	277,948
Financing receivable, year two	357,189	254,659
Financing receivable, year three	314,177	152,993
Financing receivable, year four	147,304	49,742
Financing receivable, year five	49,172	44,196
Financing receivable, prior to year five	250,057	236,590
Revolving	371,845	341,563
Revolving-term	5,651	4,017
Total LHFI	1,524,580	1,361,708
Consumer loans | Single family
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	27,011	273,786
Financing receivable, year two	354,691	253,937
Financing receivable, year three	313,866	152,773
Financing receivable, year four	147,183	49,592
Financing receivable, year five	49,126	44,124
Financing receivable, prior to year five	248,402	234,789
Revolving	0	0
Revolving-term	0	0
Total LHFI	1,140,279	1,009,001
Consumer loans | Single family | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	27,011	273,786
Financing receivable, year two	354,691	253,937
Financing receivable, year three	313,866	152,773
Financing receivable, year four	147,183	49,302
Financing receivable, year five	49,126	43,511
Financing receivable, prior to year five	245,574	231,277
Revolving	0	0
Revolving-term	0	0
Total LHFI	1,137,451	1,004,586
Consumer loans | Single family | 30-59 days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	340
Financing receivable, prior to year five	781	2,113
Revolving	0	0
Revolving-term	0	0
Total LHFI	781	2,453
Consumer loans | Single family | 60-89 days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	1,374	258
Revolving	0	0
Revolving-term	0	0
Total LHFI	1,374	258
Consumer loans | Single family | 90+ days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	290
Financing receivable, year five	0	273
Financing receivable, prior to year five	673	1,141
Revolving	0	0
Revolving-term	0	0
Total LHFI	673	1,704
Consumer loans | Home equity and other
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	2,174	4,162
Financing receivable, year two	2,498	722
Financing receivable, year three	311	220
Financing receivable, year four	121	150
Financing receivable, year five	46	72
Financing receivable, prior to year five	1,655	1,801
Revolving	371,845	341,563
Revolving-term	5,651	4,017
Total LHFI	384,301	352,707
Consumer loans | Home equity and other | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	2,165	4,156
Financing receivable, year two	2,493	692
Financing receivable, year three	311	220
Financing receivable, year four	121	150
Financing receivable, year five	46	72
Financing receivable, prior to year five	1,631	1,593
Revolving	370,462	340,567
Revolving-term	5,483	4,017
Total LHFI	382,712	351,467
Consumer loans | Home equity and other | 30-59 days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	8	0
Financing receivable, year two	2	6
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	9
Revolving	802	446
Revolving-term	162	0
Total LHFI	974	461
Consumer loans | Home equity and other | 60-89 days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	1	6
Financing receivable, year two	3	24
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	48
Revolving	419	517
Revolving-term	0	0
Total LHFI	423	595
Consumer loans | Home equity and other | 90+ days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	24	151
Revolving	162	33
Revolving-term	6	0
Total LHFI	$ 192	$ 184

X

- Definition

Financing Receivable, Excluding Accrued Interest, Revolving, Term

+ References

No definition available.

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Namespace Prefix:	hmst_
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X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-79

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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