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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Total Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | $ 9,212,322 |  | $ 9,039,686 |  |  |
Allowance for credit losses | (112,047) | $ (112,167) | (105,357) | $ (102,792) | $ (100,219) | $ (96,270)
Net loans | 9,100,275 |  | 8,934,329 |  |  |
Construction and commercial multifamily | Construction |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | 661,577 |  | 640,371 |  |  |
Allowance for credit losses | (3,951) | (2,776) | (2,885) | (3,502) | (1,553) | (1,227)
Construction and commercial multifamily | Commercial multifamily |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | 663,484 |  | 599,145 |  |  |
Allowance for credit losses | (3,609) | (3,235) | (2,475) | (2,405) | (2,066) | (1,810)
Commercial real estate | Commercial real estate owner occupied |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | 769,428 |  | 628,646 |  |  |
Allowance for credit losses | (12,089) | (10,871) | (9,443) | (9,455) | (10,343) | (10,739)
Commercial real estate | Commercial real estate non-owner occupied |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | 2,629,198 |  | 2,606,409 |  |  |
Allowance for credit losses | (37,017) | (35,843) | (38,221) | (33,282) | (36,322) | (30,724)
Commercial and industrial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | 1,379,968 |  | 1,359,249 |  |  |
Allowance for credit losses | (23,633) | (22,843) | (18,602) | (18,519) | (18,741) | (18,743)
Residential real estate | Residential real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | 2,765,410 |  | 2,760,312 |  |  |
Allowance for credit losses | (21,913) | (22,604) | (19,622) | (20,004) | (18,218) | (18,666)
Consumer loans | Home equity |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | 221,423 |  | 224,223 |  |  |
Allowance for credit losses | (2,428) | (2,094) | (2,015) | (2,102) | (2,572) | (2,173)
Consumer loans | Consumer other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total loans | 121,834 |  | 221,331 |  |  |
Allowance for credit losses | $ (7,407) | $ (11,901) | $ (12,094) | $ (13,523) | $ (10,404) | $ (12,188)

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