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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
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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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