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LOANS AND CREDIT QUALITY - Loans Credit Quality by Year and Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	$ 1,983,151	$ 1,537,105
Financing receivable, year two	976,561	915,913
Financing receivable, year three	685,228	625,936
Financing receivable, year four	343,695	509,224
Financing receivable, year five	324,120	537,197
Financing receivable, prior to year five	704,248	546,101
Revolving	514,380	556,217
Revolving-term	11,466	16,487
Total	5,542,849	5,244,180
Net (charge-offs) recoveries	(1,355)	(1,164)	$ 424
Fair Value, Recurring
Financing Receivable, Credit Quality Indicator [Line Items]
Fair value of loans held for investment	7,287	7,108
Level 3 | Fair Value, Recurring
Financing Receivable, Credit Quality Indicator [Line Items]
Fair value of loans held for investment	7,287	7,108
Commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	1,805,033	1,359,311
Financing receivable, year two	819,724	802,591
Financing receivable, year three	621,614	469,463
Financing receivable, year four	276,648	338,745
Financing receivable, year five	227,302	477,330
Financing receivable, prior to year five	496,716	297,122
Revolving	223,272	171,433
Revolving-term	6,131	8,309
Total	4,476,440	3,924,304
Commercial loans | Non-owner occupied CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	68,647	53,782
Financing receivable, year two	50,571	176,556
Financing receivable, year three	169,711	165,268
Financing receivable, year four	130,877	147,719
Financing receivable, year five	100,674	150,221
Financing receivable, prior to year five	183,024	134,165
Revolving	963	796
Revolving-term	892	1,031
Total	705,359	829,538
Commercial loans | Non-owner occupied CRE | 1-6 Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	68,647	53,782
Financing receivable, year two	50,571	176,556
Financing receivable, year three	169,711	165,268
Financing receivable, year four	130,877	147,719
Financing receivable, year five	100,674	150,221
Financing receivable, prior to year five	183,024	131,935
Revolving	963	796
Revolving-term	892	1,031
Total	705,359	827,308
Commercial loans | Non-owner occupied CRE | 7- 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	2,230
Revolving	0	0
Revolving-term	0	0
Total	0	2,230
Commercial loans | Non-owner occupied CRE | 8 - 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	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	1,315,204	711,009
Financing receivable, year two	561,666	324,246
Financing receivable, year three	286,826	100,572
Financing receivable, year four	60,372	32,693
Financing receivable, year five	26,065	166,937
Financing receivable, prior to year five	165,225	92,255
Revolving	1	380
Revolving-term	0	0
Total	2,415,359	1,428,092
Commercial loans | Multifamily | 1-6 Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	1,315,204	711,009
Financing receivable, year two	561,666	324,246
Financing receivable, year three	286,826	100,572
Financing receivable, year four	60,372	32,693
Financing receivable, year five	26,065	166,937
Financing receivable, prior to year five	165,225	92,255
Revolving	1	380
Revolving-term	0	0
Total	2,415,359	1,428,092
Commercial loans | Multifamily | 7- 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	0	0
Commercial loans | Multifamily | 8 - 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	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Multifamily construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	7,825	12,182
Financing receivable, year two	22,863	21,366
Financing receivable, year three	7,173	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	37,861	115,329
Commercial loans | Multifamily construction | 1-6 Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	7,825	12,182
Financing receivable, year two	22,863	21,366
Financing receivable, year three	7,173	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	37,861	90,627
Commercial loans | Multifamily construction | 7- 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	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, 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	0	0
Commercial loans | CRE construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	7,694	3,963
Financing receivable, year two	3,960	0
Financing receivable, year three	0	2,104
Financing receivable, year four	1,962	14,721
Financing receivable, year five	0	0
Financing receivable, prior to year five	556	614
Revolving	0	5,883
Revolving-term	0	0
Total	14,172	27,285
Commercial loans | CRE construction | 1-6 Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	7,694	3,963
Financing receivable, year two	3,960	0
Financing receivable, year three	0	2,104
Financing receivable, year four	1,962	14,721
Financing receivable, year five	0	0
Financing receivable, prior to year five	556	614
Revolving	0	5,883
Revolving-term	0	0
Total	14,172	27,285
Commercial loans | CRE construction | 7- 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	0	0
Commercial loans | CRE construction | 8 - 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	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Single family construction
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	146,595	121,233
Financing receivable, year two	35,640	47,539
Financing receivable, year three	14,509	14,055
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	77	600
Revolving	99,206	75,743
Revolving-term	0	0
Total	296,027	259,170
Commercial loans | Single family construction | 1-6 Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	146,595	121,233
Financing receivable, year two	35,640	47,539
Financing receivable, year three	14,509	14,055
Financing receivable, year four	0	0
Financing receivable, year five	0	0
Financing receivable, prior to year five	77	600
Revolving	99,206	75,743
Revolving-term	0	0
Total	296,027	259,170
Commercial loans | Single family construction | 7- 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	0	0
Commercial loans | Single family construction | 8 - 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	0	0
Revolving	0	0
Revolving-term	0	0
Total	0	0
Commercial loans | Single family construction to permanent
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	90,311	62,955
Financing receivable, year two	42,636	72,825
Financing receivable, year three	13,362	15,443
Financing receivable, year four	1,775	688
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	148,084	151,911
Commercial loans | Single family construction to permanent | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	90,311	62,955
Financing receivable, year two	42,636	72,825
Financing receivable, year three	13,362	15,443
Financing receivable, year four	1,775	688
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	0
Revolving	0	0
Revolving-term	0	0
Total	148,084	151,911
Commercial 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	0	0
Commercial 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	0	0
Commercial 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	0	0
Commercial loans | Owner occupied CRE
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	70,902	48,647
Financing receivable, year two	47,536	80,279
Financing receivable, year three	76,088	65,670
Financing receivable, year four	51,023	99,554
Financing receivable, year five	83,212	115,168
Financing receivable, prior to year five	125,248	53,515
Revolving	798	0
Revolving-term	2,899	4,423
Total	457,706	467,256
Commercial loans | Owner occupied CRE | 1-6 Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	70,902	48,647
Financing receivable, year two	47,536	60,872
Financing receivable, year three	57,423	58,582
Financing receivable, year four	47,716	85,275
Financing receivable, year five	67,042	98,046
Financing receivable, prior to year five	106,659	50,596
Revolving	798	0
Revolving-term	2,839	4,354
Total	400,915	406,372
Commercial loans | Owner occupied CRE | 7- 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	5,977
Financing receivable, year four	2,196	3,529
Financing receivable, year five	6,019	0
Financing receivable, prior to year five	145	0
Revolving	0	0
Revolving-term	60	69
Total	8,420	9,575
Commercial loans | Owner occupied CRE | 8 - Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	19,407
Financing receivable, year three	18,665	1,111
Financing receivable, year four	1,111	10,750
Financing receivable, year five	10,151	17,122
Financing receivable, prior to year five	18,444	2,919
Revolving	0	0
Revolving-term	0	0
Total	48,371	51,309
Commercial loans | Commercial business
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	97,855	345,540
Financing receivable, year two	54,852	79,780
Financing receivable, year three	53,945	61,095
Financing receivable, year four	30,639	31,547
Financing receivable, year five	17,351	20,302
Financing receivable, prior to year five	22,586	15,973
Revolving	122,304	88,631
Revolving-term	2,340	2,855
Total	401,872	645,723
Commercial loans | Commercial business | 1-6 Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	88,139	345,540
Financing receivable, year two	51,453	63,020
Financing receivable, year three	44,882	47,710
Financing receivable, year four	24,711	22,556
Financing receivable, year five	11,859	18,411
Financing receivable, prior to year five	21,258	14,972
Revolving	112,759	76,218
Revolving-term	2,104	2,577
Total	357,165	591,004
Commercial loans | Commercial business | 7- Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	10,837
Financing receivable, year three	7,396	2,058
Financing receivable, year four	0	6,653
Financing receivable, year five	4,396	0
Financing receivable, prior to year five	0	0
Revolving	5,613	3,975
Revolving-term	134	166
Total	17,539	23,689
Commercial loans | Commercial business | 8 - Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	9,716	0
Financing receivable, year two	3,399	5,923
Financing receivable, year three	1,667	11,327
Financing receivable, year four	5,928	2,338
Financing receivable, year five	1,096	1,891
Financing receivable, prior to year five	1,328	1,001
Revolving	3,932	8,438
Revolving-term	102	112
Total	27,168	31,030
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,066,409	1,319,876
Consumer loans | Single family
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	176,110	175,818
Financing receivable, year two	156,360	112,048
Financing receivable, year three	63,221	155,162
Financing receivable, year four	66,515	169,116
Financing receivable, year five	96,302	59,161
Financing receivable, prior to year five	204,823	243,818
Revolving	0	0
Revolving-term	0	0
Total	763,331	915,123
Consumer loans | Single family | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	176,110	174,994
Financing receivable, year two	156,360	111,143
Financing receivable, year three	62,369	154,757
Financing receivable, year four	66,063	168,412
Financing receivable, year five	95,988	59,161
Financing receivable, prior to year five	204,229	242,444
Revolving	0	0
Revolving-term	0	0
Total	761,119	910,911
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	570
Financing receivable, year three	291	0
Financing receivable, year four	0	318
Financing receivable, year five	0	0
Financing receivable, prior to year five	0	390
Revolving	0	0
Revolving-term	0	0
Total	291	1,278
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	314	0
Financing receivable, prior to year five	471	0
Revolving	0	0
Revolving-term	0	0
Total	785	0
Consumer loans | Single family | 90+ days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	824
Financing receivable, year two	0	335
Financing receivable, year three	561	405
Financing receivable, year four	452	386
Financing receivable, year five	0	0
Financing receivable, prior to year five	123	984
Revolving	0	0
Revolving-term	0	0
Total	1,136	2,934
Consumer loans | Home equity and other
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	2,008	1,976
Financing receivable, year two	477	1,274
Financing receivable, year three	393	1,311
Financing receivable, year four	532	1,363
Financing receivable, year five	516	706
Financing receivable, prior to year five	2,709	5,161
Revolving	291,108	384,784
Revolving-term	5,335	8,178
Total	303,078	404,753
Consumer loans | Home equity and other | Current
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	2,005	1,878
Financing receivable, year two	474	1,230
Financing receivable, year three	393	1,311
Financing receivable, year four	532	1,363
Financing receivable, year five	516	431
Financing receivable, prior to year five	2,609	5,126
Revolving	290,512	384,005
Revolving-term	5,273	8,147
Total	302,314	403,491
Consumer loans | Home equity and other | 30-59 days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	98
Financing receivable, year two	3	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	94	11
Revolving	40	66
Revolving-term	0	31
Total	137	228
Consumer loans | Home equity and other | 60-89 days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	0	0
Financing receivable, year two	0	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	0	0
Revolving	12	129
Revolving-term	62	0
Total	74	142
Consumer loans | Home equity and other | 90+ days
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	3	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	6	24
Revolving	544	584
Revolving-term	0	0
Total	553	892
Consumer loans | Home equity and other
Financing Receivable, Credit Quality Indicator [Line Items]
Total	303,078	404,753
Consumer Portfolio Segment, Adjusted For Credit Analysis
Financing Receivable, Credit Quality Indicator [Line Items]
Financing receivable, year one	178,118	177,794
Financing receivable, year two	156,837	113,322
Financing receivable, year three	63,614	156,473
Financing receivable, year four	67,047	170,479
Financing receivable, year five	96,818	59,867
Financing receivable, prior to year five	207,532	248,979
Revolving	291,108	384,784
Revolving-term	5,335	8,178
Total	$ 1,066,409	$ 1,319,876

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Financing Receivable, Revolving, Term

+ References

No definition available.

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Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
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-Paragraph (a)
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Amount of financing receivable originated more than five years prior to current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 6
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Amount of financing receivable originated four years prior to current fiscal year.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

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