XML 54 R45.htm IDEA: XBRL DOCUMENT v3.23.3

LOANS AND CREDIT QUALITY - Loans Credit Quality by Year and Type (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	$ 254,942	$ 2,544,193
Financing receivable, year two	2,525,766	1,797,256
Financing receivable, year three	1,781,690	875,008
Financing receivable, year four	779,505	533,369
Financing receivable, year five	470,070	255,162
Financing receivable, prior to year five	977,921	814,005
Revolving	641,952	599,278
Revolving-term	8,655	8,049
Total	7,440,501	7,426,320
Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	1,225	5,868
Level 3 | Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Single family LHFI	1,225	5,868
30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	4,081	4,823
60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,613	2,020
90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	3,337	4,372
Commercial loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	237,287	2,266,245
Financing receivable, year two	2,200,543	1,542,597
Financing receivable, year three	1,476,462	722,015
Financing receivable, year four	630,723	483,627
Financing receivable, year five	420,571	210,966
Financing receivable, prior to year five	717,946	577,415
Revolving	284,117	257,715
Revolving-term	2,333	4,032
Total	5,969,982	6,064,612
Commercial loans | Non-owner occupied CRE
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,514	68,301
Financing receivable, year two	70,440	68,356
Financing receivable, year three	68,131	42,181
Financing receivable, year four	41,245	139,760
Financing receivable, year five	136,433	89,899
Financing receivable, prior to year five	314,560	246,786
Revolving	760	2,016
Revolving-term	0	786
Total	633,083	658,085
Commercial loans | Non-owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,514	68,301
Financing receivable, year two	70,440	68,356
Financing receivable, year three	68,131	42,181
Financing receivable, year four	41,245	139,760
Financing receivable, year five	119,562	87,197
Financing receivable, prior to year five	280,125	242,544
Revolving	599	2,016
Revolving-term	0	786
Total	581,616	651,141
Commercial loans | Non-owner occupied CRE | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	2,702
Financing receivable, prior to year five	34,435	4,242
Revolving	0	0
Revolving-term	0	0
Total	34,435	6,944
Commercial loans | Non-owner occupied CRE | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	16,871	0
Financing receivable, prior to year five	0	0
Revolving	161	0
Revolving-term	0	0
Total	17,032	0
Commercial loans | Multifamily
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	108,330	1,828,568
Financing receivable, year two	1,815,620	1,165,434
Financing receivable, year three	1,157,091	532,970
Financing receivable, year four	496,707	241,808
Financing receivable, year five	192,749	59,340
Financing receivable, prior to year five	186,712	147,634
Revolving	0	0
Revolving-term	0	0
Total	3,957,209	3,975,754
Commercial loans | Multifamily | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	108,330	1,828,568
Financing receivable, year two	1,815,620	1,165,434
Financing receivable, year three	1,153,149	528,077
Financing receivable, year four	483,726	221,974
Financing receivable, year five	190,380	59,340
Financing receivable, prior to year five	179,339	140,126
Revolving	0	0
Revolving-term	0	0
Total	3,930,544	3,943,519
Commercial loans | Multifamily | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	3,942	4,893
Financing receivable, year four	12,981	19,834
Financing receivable, year five	2,369	0
Financing receivable, prior to year five	4,290	7,508
Revolving	0	0
Revolving-term	0	0
Total	23,582	32,235
Commercial loans | Multifamily | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	3,083	0
Revolving	0	0
Revolving-term	0	0
Total	3,083	0
Commercial loans | Multifamily construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	(206)	18,110
Financing receivable, year two	41,430	63,394
Financing receivable, year three	100,778	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	142,002	95,117
Commercial loans | Multifamily construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	(206)	18,110
Financing receivable, year two	41,430	63,394
Financing receivable, year three	100,778	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	142,002	95,117
Commercial loans | Multifamily construction | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	0	0
Commercial loans | Multifamily construction | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	0	0
Commercial loans | CRE construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	7	341
Financing receivable, year two	0	14,348
Financing receivable, year three	14,459	3,960
Financing receivable, year four	3,871	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	305
Revolving	0	0
Revolving-term	0	0
Total	18,337	18,954
Commercial loans | CRE construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	7	341
Financing receivable, year two	0	14,348
Financing receivable, year three	14,459	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	14,466	18,954
Commercial loans | CRE construction | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	0	0
Commercial loans | CRE construction | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	0
Financing receivable, year three	0	0
Financing receivable, year four	3,871	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	3,871	0
Commercial loans | Single family construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	62,297	149,133
Financing receivable, year two	60,609	57,718
Financing receivable, year three	18,552	24,807
Financing receivable, year four	0	519
Financing receivable, year five	0	0
Financing receivable, prior to year five	72	74
Revolving	126,829	123,303
Revolving-term	0	0
Total	268,359	355,554
Commercial loans | Single family construction | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	62,297	149,133
Financing receivable, year two	56,402	50,936
Financing receivable, year three	17,502	24,807
Financing receivable, year four	0	519
Financing receivable, year five	0	0
Financing receivable, prior to year five	72	74
Revolving	126,829	123,303
Revolving-term	0	0
Total	263,102	348,772
Commercial loans | Single family construction | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	4,207	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	4,207	0
Commercial loans | Single family construction | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	6,782
Financing receivable, year three	1,050	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	1,050	6,782
Commercial loans | Single family construction to permanent
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	23,201	66,034
Financing receivable, year two	82,282	76,814
Financing receivable, year three	30,299	11,128
Financing receivable, year four	1,809	3,268
Financing receivable, year five	0	794
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	137,591	158,038
Commercial loans | Single family construction to permanent | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	23,201	66,034
Financing receivable, year two	82,282	76,814
Financing receivable, year three	30,299	11,128
Financing receivable, year four	1,809	3,268
Financing receivable, year five	0	794
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	137,591	158,038
Commercial loans | Single family construction to permanent | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	0	0
Commercial loans | Single family construction to permanent | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	0	0
Commercial loans | Single family construction to permanent | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	0	0
Commercial loans | Owner occupied CRE
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	12,638	70,192
Financing receivable, year two	71,137	52,662
Financing receivable, year three	48,241	44,778
Financing receivable, year four	41,918	71,652
Financing receivable, year five	68,744	44,785
Financing receivable, prior to year five	184,669	158,187
Revolving	1	3
Revolving-term	905	1,104
Total	428,253	443,363
Commercial loans | Owner occupied CRE | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	10,747	70,192
Financing receivable, year two	69,650	51,919
Financing receivable, year three	40,278	44,778
Financing receivable, year four	41,918	71,652
Financing receivable, year five	66,055	36,457
Financing receivable, prior to year five	143,484	139,691
Revolving	1	3
Revolving-term	905	1,104
Total	373,038	415,796
Commercial loans | Owner occupied CRE | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,891	0
Financing receivable, year two	1,487	743
Financing receivable, year three	7,963	0
Financing receivable, year four	0	0
Financing receivable, year five	2,689	6,179
Financing receivable, prior to year five	34,784	13,485
Revolving	0	0
Revolving-term	0	0
Total	48,814	20,407
Commercial loans | Owner occupied CRE | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	2,149
Financing receivable, prior to year five	6,401	5,011
Revolving	0	0
Revolving-term	0	0
Total	6,401	7,160
Commercial loans | Commercial business
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	29,506	65,566
Financing receivable, year two	59,025	43,871
Financing receivable, year three	38,911	48,578
Financing receivable, year four	45,173	26,620
Financing receivable, year five	22,645	16,148
Financing receivable, prior to year five	31,933	24,429
Revolving	156,527	132,393
Revolving-term	1,428	2,142
Total	385,148	359,747
Commercial loans | Commercial business | Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	29,506	65,566
Financing receivable, year two	47,718	42,921
Financing receivable, year three	33,317	45,940
Financing receivable, year four	38,177	18,594
Financing receivable, year five	18,217	13,548
Financing receivable, prior to year five	27,702	18,779
Revolving	152,176	130,427
Revolving-term	1,354	2,041
Total	348,167	337,816
Commercial loans | Commercial business | Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	11,307	612
Financing receivable, year three	3,270	0
Financing receivable, year four	0	3,577
Financing receivable, year five	953	9
Financing receivable, prior to year five	164	3,444
Revolving	4,091	403
Revolving-term	0	0
Total	19,785	8,045
Commercial loans | Commercial business | Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	338
Financing receivable, year three	2,324	2,638
Financing receivable, year four	6,996	4,449
Financing receivable, year five	3,475	2,591
Financing receivable, prior to year five	4,067	2,206
Revolving	260	1,563
Revolving-term	74	101
Total	17,196	13,886
Consumer loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	17,655	277,948
Financing receivable, year two	325,223	254,659
Financing receivable, year three	305,228	152,993
Financing receivable, year four	148,782	49,742
Financing receivable, year five	49,499	44,196
Financing receivable, prior to year five	259,975	236,590
Revolving	357,835	341,563
Revolving-term	6,322	4,017
Total	1,470,519	1,361,708
Consumer loans | Single family
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	16,110	273,786
Financing receivable, year two	322,349	253,937
Financing receivable, year three	304,831	152,773
Financing receivable, year four	148,640	49,592
Financing receivable, year five	49,434	44,124
Financing receivable, prior to year five	258,280	234,789
Revolving	0	0
Revolving-term	0	0
Total	1,099,644	1,009,001
Consumer loans | Single family | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	16,110	273,786
Financing receivable, year two	322,349	253,937
Financing receivable, year three	304,831	152,773
Financing receivable, year four	148,640	49,302
Financing receivable, year five	49,434	43,511
Financing receivable, prior to year five	254,394	231,277
Revolving	0	0
Revolving-term	0	0
Total	1,095,758	1,004,586
Consumer loans | Single family | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	525	2,113
Revolving	0	0
Revolving-term	0	0
Total	525	2,453
Consumer loans | Single family | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	461	258
Revolving	0	0
Revolving-term	0	0
Total	461	258
Consumer loans | Single family | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
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	2,900	1,141
Revolving	0	0
Revolving-term	0	0
Total	2,900	1,704
Consumer loans | Home equity and other
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,545	4,162
Financing receivable, year two	2,874	722
Financing receivable, year three	397	220
Financing receivable, year four	142	150
Financing receivable, year five	65	72
Financing receivable, prior to year five	1,695	1,801
Revolving	357,835	341,563
Revolving-term	6,322	4,017
Total	370,875	352,707
Consumer loans | Home equity and other | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,542	4,156
Financing receivable, year two	2,839	692
Financing receivable, year three	393	220
Financing receivable, year four	142	150
Financing receivable, year five	65	72
Financing receivable, prior to year five	1,670	1,593
Revolving	356,808	340,567
Revolving-term	6,223	4,017
Total	369,682	351,467
Consumer loans | Home equity and other | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	3	0
Financing receivable, year two	4	6
Financing receivable, year three	4	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	9
Revolving	557	446
Revolving-term	26	0
Total	594	461
Consumer loans | Home equity and other | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	6
Financing receivable, year two	1	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	68	517
Revolving-term	73	0
Total	142	595
Consumer loans | Home equity and other | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	30	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	25	151
Revolving	402	33
Revolving-term	0	0
Total	$ 457	$ 184

X

- Definition

Financing Receivable, Excluding Accrued Interest, Revolving, Term

+ References

No definition available.

+ Details

Name:	hmst_FinancingReceivableExcludingAccruedInterestRevolvingTerm
Namespace Prefix:	hmst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableBeforeAllowanceForCreditLossAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
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
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

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

X

- Definition

Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn.

+ 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
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
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 four 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
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
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 three 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
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
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 in 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
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
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 two 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
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
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 in fiscal year 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
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 3: 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

+ Details

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

X

- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Publisher FASB
-URI https://asc.fasb.org//310-10/tableOfContent

+ Details

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

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hmst_NonOwnerOccupiedCommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hmst_MultifamilyResidentialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hmst_MultifamilyConstructionNettingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hmst_CommercialRealEstateConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hmst_SingleFamilyConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hmst_SingleFamilyConstructionToPermanentAdjustedForCreditAnalysisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables1To29DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hmst_OwnerOccupiedCommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=hmst_HomeEquityLineOfCreditAdjustedForCreditAnalysisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: