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LOANS AND CREDIT QUALITY - Loans Credit Quality by Year and Type (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	$ 1,547,833	$ 1,537,105
Financing receivable, year two	1,005,273	915,913
Financing receivable, year three	740,223	625,936
Financing receivable, year four	381,498	509,224
Financing receivable, year five	382,896	537,197
Financing receivable, prior to year five	784,920	546,101
Revolving	498,796	556,217
Revolving-term	12,818	16,487
Total	5,354,257	5,244,180
Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Fair value of loans held for investment	4,507	7,108
Level 3 | Recurring
Financing Receivable, before Allowance for Credit Loss [Abstract]
Fair value of loans held for investment	4,507	7,108
30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,554	2,389
60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,202	553
90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	8,361	11,476
Commercial loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,406,915	1,359,311
Financing receivable, year two	841,738	802,591
Financing receivable, year three	661,597	469,463
Financing receivable, year four	296,263	338,745
Financing receivable, year five	273,148	477,330
Financing receivable, prior to year five	562,274	297,122
Revolving	196,235	171,433
Revolving-term	6,445	8,309
Total	4,244,615	3,924,304
Commercial loans | Non-owner occupied commercial real estate
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	35,832	53,782
Financing receivable, year two	50,863	176,556
Financing receivable, year three	172,296	165,268
Financing receivable, year four	133,472	147,719
Financing receivable, year five	132,238	150,221
Financing receivable, prior to year five	227,226	134,165
Revolving	1,189	796
Revolving-term	915	1,031
Total	754,031	829,538
Commercial loans | Non-owner occupied commercial real estate | 1-6 Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	35,832	53,782
Financing receivable, year two	50,863	176,556
Financing receivable, year three	172,296	165,268
Financing receivable, year four	133,472	147,719
Financing receivable, year five	132,238	150,221
Financing receivable, prior to year five	225,012	131,935
Revolving	1,189	796
Revolving-term	915	1,031
Total	751,817	827,308
Commercial loans | Non-owner occupied commercial real estate | 7- 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	2,214	2,230
Revolving	0	0
Revolving-term	0	0
Total	2,214	2,230
Commercial loans | Non-owner occupied commercial real estate | 8 - 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 | Multifamily
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	972,806	711,009
Financing receivable, year two	557,201	324,246
Financing receivable, year three	289,164	100,572
Financing receivable, year four	65,618	32,693
Financing receivable, year five	29,218	166,937
Financing receivable, prior to year five	176,093	92,255
Revolving	56	380
Revolving-term	0	0
Total	2,090,156	1,428,092
Commercial loans | Multifamily | 1-6 Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	972,806	711,009
Financing receivable, year two	557,201	324,246
Financing receivable, year three	289,164	100,572
Financing receivable, year four	65,618	32,693
Financing receivable, year five	29,218	166,937
Financing receivable, prior to year five	176,093	92,255
Revolving	56	380
Revolving-term	0	0
Total	2,090,156	1,428,092
Commercial loans | Multifamily | 7- 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 | 8 - 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 | Multifamily construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	4,194	12,182
Financing receivable, year two	25,363	21,366
Financing receivable, year three	20,748	45,256
Financing receivable, year four	0	11,823
Financing receivable, year five	0	24,702
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	50,305	115,329
Commercial loans | Multifamily construction | 1-6 Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	4,194	12,182
Financing receivable, year two	25,363	21,366
Financing receivable, year three	20,748	45,256
Financing receivable, year four	0	11,823
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	50,305	90,627
Commercial loans | Multifamily construction | 7- 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	24,702
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	24,702
Commercial loans | Multifamily construction | 8 - 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 | Commercial real estate construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	2,712	3,963
Financing receivable, year two	3,961	0
Financing receivable, year three	0	2,104
Financing receivable, year four	1,998	14,721
Financing receivable, year five	0	0
Financing receivable, prior to year five	563	614
Revolving	8,672	5,883
Revolving-term	0	0
Total	17,906	27,285
Commercial loans | Commercial real estate construction | 1-6 Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	2,712	3,963
Financing receivable, year two	3,961	0
Financing receivable, year three	0	2,104
Financing receivable, year four	1,998	14,721
Financing receivable, year five	0	0
Financing receivable, prior to year five	563	614
Revolving	8,672	5,883
Revolving-term	0	0
Total	17,906	27,285
Commercial loans | Commercial real estate construction | 7- 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 | Commercial real estate construction | 8 - 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 | Single family construction
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	151,418	121,233
Financing receivable, year two	42,188	47,539
Financing receivable, year three	17,677	14,055
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	78	600
Revolving	91,915	75,743
Revolving-term	0	0
Total	303,276	259,170
Commercial loans | Single family construction | 1-6 Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	151,418	121,233
Financing receivable, year two	42,188	47,539
Financing receivable, year three	17,677	14,055
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	78	600
Revolving	91,915	75,743
Revolving-term	0	0
Total	303,276	259,170
Commercial loans | Single family construction | 7- 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 | Single family construction | 8 - 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 | Single family construction to permanent, adjusted for credit analysis
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	62,456	62,955
Financing receivable, year two	55,561	72,825
Financing receivable, year three	21,067	15,443
Financing receivable, year four	3,751	688
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	142,835	151,911
Commercial loans | Single family construction to permanent, adjusted for credit analysis | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	62,456	62,955
Financing receivable, year two	55,561	72,825
Financing receivable, year three	21,067	15,443
Financing receivable, year four	3,751	688
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	142,835	151,911
Commercial loans | Single family construction to permanent, adjusted for credit analysis | 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, adjusted for credit analysis | 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, adjusted for credit analysis | 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 commercial real estate
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	45,688	48,647
Financing receivable, year two	47,907	80,279
Financing receivable, year three	78,204	65,670
Financing receivable, year four	53,901	99,554
Financing receivable, year five	88,842	115,168
Financing receivable, prior to year five	132,318	53,515
Revolving	549	0
Revolving-term	2,941	4,423
Total	450,350	467,256
Commercial loans | Owner occupied commercial real estate | 1-6 Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	45,688	48,647
Financing receivable, year two	47,907	60,872
Financing receivable, year three	59,378	58,582
Financing receivable, year four	50,584	85,275
Financing receivable, year five	72,188	98,046
Financing receivable, prior to year five	113,575	50,596
Revolving	549	0
Revolving-term	2,878	4,354
Total	392,747	406,372
Commercial loans | Owner occupied commercial real estate | 7- 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	5,977
Financing receivable, year four	2,206	3,529
Financing receivable, year five	6,063	0
Financing receivable, prior to year five	212	0
Revolving	0	0
Revolving-term	63	69
Total	8,544	9,575
Commercial loans | Owner occupied commercial real estate | 8 - Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	19,407
Financing receivable, year three	18,826	1,111
Financing receivable, year four	1,111	10,750
Financing receivable, year five	10,591	17,122
Financing receivable, prior to year five	18,531	2,919
Revolving	0	0
Revolving-term	0	0
Total	49,059	51,309
Commercial loans | Commercial business
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	131,809	345,540
Financing receivable, year two	58,694	79,780
Financing receivable, year three	62,441	61,095
Financing receivable, year four	37,523	31,547
Financing receivable, year five	22,850	20,302
Financing receivable, prior to year five	25,996	15,973
Revolving	93,854	88,631
Revolving-term	2,589	2,855
Total	435,756	645,723
Commercial loans | Commercial business | 1-6 Pass
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	128,807	345,540
Financing receivable, year two	58,648	63,020
Financing receivable, year three	49,889	47,710
Financing receivable, year four	27,876	22,556
Financing receivable, year five	16,780	18,411
Financing receivable, prior to year five	23,331	14,972
Revolving	88,636	76,218
Revolving-term	2,341	2,577
Total	396,308	591,004
Commercial loans | Commercial business | 7- Special Mention
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	10,837
Financing receivable, year three	9,145	2,058
Financing receivable, year four	1,518	6,653
Financing receivable, year five	4,503	0
Financing receivable, prior to year five	57	0
Revolving	5,500	3,975
Revolving-term	142	166
Total	20,865	23,689
Commercial loans | Commercial business | 8 - Substandard
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	3,002	0
Financing receivable, year two	46	5,923
Financing receivable, year three	3,407	11,327
Financing receivable, year four	8,129	2,338
Financing receivable, year five	1,567	1,891
Financing receivable, prior to year five	2,608	1,001
Revolving	(282)	8,438
Revolving-term	106	112
Total	18,583	31,030
Consumer loans
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,109,642	1,319,876
Consumer loans | Single family
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	139,731	175,818
Financing receivable, year two	162,824	112,048
Financing receivable, year three	78,130	155,162
Financing receivable, year four	84,628	169,116
Financing receivable, year five	109,211	59,161
Financing receivable, prior to year five	219,403	243,818
Revolving	0	0
Revolving-term	0	0
Total	793,927	915,123
Consumer loans | Single family | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	139,731	174,994
Financing receivable, year two	162,824	111,143
Financing receivable, year three	78,130	154,757
Financing receivable, year four	83,770	168,412
Financing receivable, year five	108,684	59,161
Financing receivable, prior to year five	217,957	242,444
Revolving	0	0
Revolving-term	0	0
Total	791,096	910,911
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	570
Financing receivable, year three	0	0
Financing receivable, year four	0	318
Financing receivable, year five	212	0
Financing receivable, prior to year five	766	390
Revolving	0	0
Revolving-term	0	0
Total	978	1,278
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	315	0
Financing receivable, prior to year five	277	0
Revolving	0	0
Revolving-term	0	0
Total	592	0
Consumer loans | Single family | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	824
Financing receivable, year two	0	335
Financing receivable, year three	0	405
Financing receivable, year four	858	386
Financing receivable, year five	0	0
Financing receivable, prior to year five	403	984
Revolving	0	0
Revolving-term	0	0
Total	1,261	2,934
Consumer loans | Home equity and other
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	315,715	404,753
Consumer loans, adjusted for credit analysis
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	140,918	177,794
Financing receivable, year two	163,535	113,322
Financing receivable, year three	78,626	156,473
Financing receivable, year four	85,235	170,479
Financing receivable, year five	109,748	59,867
Financing receivable, prior to year five	222,646	248,979
Revolving	302,561	384,784
Revolving-term	6,373	8,178
Total	1,109,642	1,319,876
Consumer loans, adjusted for credit analysis | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,554	2,389
Consumer loans, adjusted for credit analysis | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,202	553
Consumer loans, adjusted for credit analysis | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	8,361	11,476
Consumer loans, adjusted for credit analysis | Single family
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	793,927	915,123
Consumer loans, adjusted for credit analysis | Single family | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,294	2,161
Consumer loans, adjusted for credit analysis | Single family | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	1,198	418
Consumer loans, adjusted for credit analysis | Single family | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	8,361	11,476
Consumer loans, adjusted for credit analysis | Home equity, adjusted for credit analysis
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,187	1,976
Financing receivable, year two	711	1,274
Financing receivable, year three	496	1,311
Financing receivable, year four	607	1,363
Financing receivable, year five	537	706
Financing receivable, prior to year five	3,243	5,161
Revolving	302,561	384,784
Revolving-term	6,373	8,178
Total	315,715	404,753
Consumer loans, adjusted for credit analysis | Home equity, adjusted for credit analysis | Current
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	1,184	1,878
Financing receivable, year two	707	1,230
Financing receivable, year three	496	1,311
Financing receivable, year four	607	1,363
Financing receivable, year five	537	431
Financing receivable, prior to year five	2,930	5,126
Revolving	301,977	384,005
Revolving-term	6,373	8,147
Total	314,811	403,491
Consumer loans, adjusted for credit analysis | Home equity, adjusted for credit analysis | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	98
Financing receivable, year two	2	22
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	248	11
Revolving	183	66
Revolving-term	0	31
Total	433	228
Consumer loans, adjusted for credit analysis | Home equity, adjusted for credit analysis | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	3	0
Financing receivable, year two	2	13
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	0
Revolving	0	129
Revolving-term	0	0
Total	6	142
Consumer loans, adjusted for credit analysis | Home equity, adjusted for credit analysis | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Financing receivable, year one	0	0
Financing receivable, year two	0	9
Financing receivable, year three	0	0
Financing receivable, year four	0	0
Financing receivable, year five	0	275
Financing receivable, prior to year five	64	24
Revolving	401	584
Revolving-term	0	0
Total	465	892
Consumer loans, adjusted for credit analysis | Home equity and other
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	315,715	404,753
Consumer loans, adjusted for credit analysis | Home equity and other | 30-59 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	260	228
Consumer loans, adjusted for credit analysis | Home equity and other | 60-89 days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	4	135
Consumer loans, adjusted for credit analysis | Home equity and other | 90+ days
Financing Receivable, before Allowance for Credit Loss [Abstract]
Total	$ 0	$ 0

X

- Definition

Financing Receivable, Excluding Accrued Interest, Revolving, Term

+ References

No definition available.

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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
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