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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Past Due (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 8,882,402	$ 8,335,309
Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	443,856	319,452
Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	597,472	620,088
Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	696,771	640,489
Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,557,036	2,496,237
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,438,062	1,445,236
Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,677,053	2,312,447
Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	225,434	227,450
Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	246,718	273,910
30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	9,219	7,290
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	0	0
30-59 Days Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	959	122
30-59 Days Past Due | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	151	143
30-59 Days Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,316	1,173
30-59 Days Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	4,328	3,694
30-59 Days Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	547	168
30-59 Days Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,918	1,990
60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	5,928	4,871
60-89 Days Past Due | Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	0	0
60-89 Days Past Due | Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	0	214
60-89 Days Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	650	0
60-89 Days Past Due | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	117	0
60-89 Days Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	679	1,438
60-89 Days Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,526	2,134
60-89 Days Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	327	57
60-89 Days Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,629	1,028
90 Days or Greater Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	36,200	38,152
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	0	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	2,207	3,302
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	162	191
90 Days or Greater Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	17,156	18,658
90 Days or Greater Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	12,859	11,724
90 Days or Greater Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,097	2,119
90 Days or Greater Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,719	2,158
Total Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	51,347	50,313
Total Past Due | Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	0	0
Total Past Due | Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	0	214
Total Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	3,816	3,424
Total Past Due | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	430	334
Total Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	19,151	21,269
Total Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	19,713	17,552
Total Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,971	2,344
Total Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	5,266	5,176
Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	8,831,055	8,284,996
Current | Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	443,856	319,452
Current | Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	597,472	619,874
Current | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	692,955	637,065
Current | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,556,606	2,495,903
Current | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,418,911	1,423,967
Current | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,657,340	2,294,895
Current | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	222,463	225,106
Current | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 241,452	$ 268,734

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

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+ 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

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