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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Past Due (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 9,212,322	$ 9,039,686
Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	661,577	640,371
Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	663,484	599,145
Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	769,428	628,646
Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,629,198	2,606,409
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,379,968	1,359,249
Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,765,410	2,760,312
Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	221,423	224,223
Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	121,834	221,331
Total Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	48,777	49,085
Total Past Due | Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	594	0
Total Past Due | Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	5,420	5,623
Total Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	4,539	1,671
Total Past Due | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	3,615	4,188
Total Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	12,670	12,207
Total Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	15,894	17,299
Total Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,773	2,486
Total Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	3,272	5,611
30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	13,311	17,644
30-59 Days Past Due | Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	0	0
30-59 Days Past Due | Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	379	5,436
30-59 Days Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,645	581
30-59 Days Past Due | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	37	139
30-59 Days Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	3,514	2,749
30-59 Days Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	6,004	5,669
30-59 Days Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	517	707
30-59 Days Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,215	2,363
60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	5,216	4,496
60-89 Days Past Due | Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	594	0
60-89 Days Past Due | Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	429	187
60-89 Days Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	615	286
60-89 Days Past Due | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	0	251
60-89 Days Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	703	689
60-89 Days Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,227	943
60-89 Days Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	751	498
60-89 Days Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	897	1,642
90 Days or Greater Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	30,250	26,945
90 Days or Greater Past Due | Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	0	0
90 Days or Greater Past Due | Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	4,612	0
90 Days or Greater Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,279	804
90 Days or Greater Past Due | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	3,578	3,798
90 Days or Greater Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	8,453	8,769
90 Days or Greater Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	8,663	10,687
90 Days or Greater Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,505	1,281
90 Days or Greater Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,160	1,606
Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	9,163,545	8,990,601
Current | Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	660,983	640,371
Current | Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	658,064	593,522
Current | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	764,889	626,975
Current | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,625,583	2,602,221
Current | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,367,298	1,347,042
Current | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,749,516	2,743,013
Current | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	218,650	221,737
Current | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 118,562	$ 215,720

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
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-Paragraph 13
-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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-Name Accounting Standards Codification
-Section 45
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