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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Total Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 7,943,481		$ 6,825,847
Allowance for credit losses	96,013	$ 99,021	106,094	$ 112,916	$ 119,044	$ 127,302
Net loans	7,847,468		6,719,753
Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	367,997		324,282
Allowance for credit losses	1,231	1,710	3,206	4,633	3,919	5,111
Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	612,890		515,817
Allowance for credit losses	1,720	4,621	6,120	7,151	7,197	5,916
Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	632,001		606,477
Allowance for credit losses	10,185	10,687	12,752	12,848	13,242	12,380
Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,285,770		2,156,929
Allowance for credit losses	29,421	26,166	32,106	31,776	30,315	35,850
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,395,172		1,284,429
Allowance for credit losses	18,635	22,914	22,584	25,934	28,225	25,013
Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,128,039		1,489,248
Allowance for credit losses	19,838	16,411	22,406	22,945	23,643	28,491
Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	234,027		252,366
Allowance for credit losses	2,421	2,828	4,006	4,655	5,432	6,482
Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	287,585		196,299
Allowance for credit losses	$ 12,562	$ 13,684	$ 2,914	$ 2,974	$ 7,071	$ 8,059

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
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