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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jul. 25, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | $ 6,961,032 |  | $ 7,115,038
Collateral Pledged |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 57,504 |  | 51,174
Commercial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 2,457 |  | 933
Residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 41,302 |  | 26,045
Business Assets |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 13,419 |  | 24,083
Automobile |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 326 |  | 113
Commercial | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,942,964 |  | 1,845,960
Commercial | Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,173,332 |  | 1,259,651
Commercial | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,654,272 |  | 1,689,943
Collateral dependent loans | 1,118 |  |
Commercial | SBA |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 56,600 |  | 68,137
Commercial | Collateral Pledged | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 6,661 |  | 18,392
Commercial | Collateral Pledged | Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,864 |  | 910
Commercial | Collateral Pledged | SBA |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 7,569 |  | 10,416
Commercial | Commercial | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Commercial | Commercial | Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,324 |  | 910
Commercial | Commercial | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Collateral dependent loans | 1,118 |  |
Commercial | Commercial | SBA |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 15 |  | 23
Commercial | Residential | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Commercial | Residential | Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 540 |  | 0
Commercial | Residential | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Collateral dependent loans | 0 |  |
Commercial | Residential | SBA |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 796 |  | 4,702
Commercial | Business Assets | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 6,661 |  | 18,392
Commercial | Business Assets | Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Commercial | Business Assets | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Collateral dependent loans | 0 |  |
Commercial | Business Assets | SBA |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 6,758 |  | 5,691
Commercial | Automobile | Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Commercial | Automobile | Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Commercial | Automobile | Multifamily |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Collateral dependent loans | 0 |  |
Commercial | Automobile | SBA |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Consumer | Single family residential mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 1,782,655 | $ 1,800,000 | 1,920,806
Consumer | Other consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 88,494 |  | 86,988
Consumer | Collateral Pledged | Single family residential mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 39,836 |  | 21,262
Consumer | Collateral Pledged | Other consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 456 |  | 194
Consumer | Commercial | Single family residential mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Consumer | Commercial | Other consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Consumer | Residential | Single family residential mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 39,836 |  | 21,262
Consumer | Residential | Other consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 130 |  | 81
Consumer | Business Assets | Single family residential mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Consumer | Business Assets | Other consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Consumer | Automobile | Single family residential mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | 0 |  | 0
Consumer | Automobile | Other consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total loans | $ 326 |  | $ 113

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