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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Total Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 8,882,402		$ 8,335,309
Allowance for credit losses	100,219	$ 97,991	96,270	$ 99,021	$ 99,475	$ 106,094
Net loans	8,782,183		8,239,039
Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	443,856		319,452
Allowance for credit losses	1,553	1,536	1,227	1,710	2,505	3,206
Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	597,472		620,088
Allowance for credit losses	2,066	1,698	1,810	4,621	5,771	6,120
Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	696,771		640,489
Allowance for credit losses	10,343	10,278	10,739	10,688	11,498	12,752
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
Allowance for credit losses	36,322	33,408	30,724	26,165	25,814	32,106
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,438,062		1,445,236
Allowance for credit losses	18,741	20,164	18,743	22,914	22,949	22,584
Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,677,053		2,312,447
Allowance for credit losses	18,218	17,590	18,666	16,410	17,816	22,406
Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	225,434		227,450
Allowance for credit losses	2,572	2,320	2,173	2,828	3,303	4,006
Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	246,718		273,910
Allowance for credit losses	$ 10,404	$ 10,997	$ 12,188	$ 13,685	$ 9,819	$ 2,914

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Amount excluding accrued interest, of allowance for credit loss on 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
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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
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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-Section 45
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