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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Past Due (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 7,943,481	$ 6,825,847
Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	367,997	324,282
Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	612,890	515,817
Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	632,001	606,477
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
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,395,172	1,284,429
Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,128,039	1,489,248
Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	234,027	252,366
Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	287,585	196,299
30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	10,059	35,352
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	82
30-59 Days Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	391	0
30-59 Days Past Due | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	368	25,420
30-59 Days Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,844	2,700
30-59 Days Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	4,566	5,529
30-59 Days Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	170	258
30-59 Days Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,720	1,363
60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	4,605	4,511
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	306
60-89 Days Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	114	400
60-89 Days Past Due | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	3	653
60-89 Days Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,192	709
60-89 Days Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,281	2,015
60-89 Days Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	206	108
60-89 Days Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	809	320
90 Days or Greater Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	44,139	38,597
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	187
90 Days or Greater Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	3,831	4,221
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	206	9,049
90 Days or Greater Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	22,986	6,836
90 Days or Greater Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	13,038	13,264
90 Days or Greater Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,216	2,158
90 Days or Greater Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,862	2,882
Total Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	58,803	78,460
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	575
Total Past Due | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	4,336	4,621
Total Past Due | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	577	35,122
Total Past Due | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	27,022	10,245
Total Past Due | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	19,885	20,808
Total Past Due | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,592	2,524
Total Past Due | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	4,391	4,565
Current
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	7,884,678	6,747,387
Current | Construction and commercial multifamily | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	367,997	324,282
Current | Construction and commercial multifamily | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	612,890	515,242
Current | Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	627,665	601,856
Current | Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,285,193	2,121,807
Current | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	1,368,150	1,274,184
Current | Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	2,108,154	1,468,440
Current | Consumer loans | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	231,435	249,842
Current | Consumer loans | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 283,194	$ 191,734

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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