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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Total Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 8,681,967	$ 8,335,309
Allowance for credit losses	97,991	96,270	$ 99,475	$ 106,094
Net loans	8,583,976	8,239,039
Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	373,953	319,452
Allowance for credit losses	1,536	1,227	2,505	3,206
Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	618,073	620,088
Allowance for credit losses	1,698	1,810	5,771	6,120
Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	695,890	640,489
Allowance for credit losses	10,278	10,739	11,498	12,752
Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,531,946	2,496,237
Allowance for credit losses	33,408	30,724	25,814	32,106
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,517,556	1,445,236
Allowance for credit losses	20,164	18,743	22,949	22,584
Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,463,981	2,312,447
Allowance for credit losses	17,590	18,666	17,816	22,406
Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	222,393	227,450
Allowance for credit losses	2,320	2,173	3,303	4,006
Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	258,175	273,910
Allowance for credit losses	$ 10,997	$ 12,188	$ 9,819	$ 2,914

X

- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

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-Publisher FASB
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-Topic 326
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-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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