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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jul. 25, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | $ 6,961,032 |  | $ 7,115,038
30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 27,942 |  | 41,101
60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 22,616 |  | 5,565
Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 39,692 |  | 44,554
Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 90,250 |  | 91,220
Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 6,870,782 |  | 7,023,818
Commercial | Commercial and industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,942,964 |  | 1,845,960
Commercial | Commercial real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,173,332 |  | 1,259,651
Commercial | Multifamily |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,654,272 |  | 1,689,943
Commercial | SBA |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 56,600 |  | 68,137
Commercial | Construction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 262,715 |  | 243,553
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,942,964 |  | 1,845,960
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 452 |  | 4,002
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 2,452 |  | 481
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 9,210 |  | 13,833
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 12,114 |  | 18,316
Commercial | Loans and Finance Receivables, Traditional | Commercial and industrial | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,930,850 |  | 1,827,644
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,173,332 |  | 1,259,651
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,326 |  | 311
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 3,569 |  | 0
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,324 |  | 910
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 6,219 |  | 1,221
Commercial | Loans and Finance Receivables, Traditional | Commercial real estate | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,167,113 |  | 1,258,430
Commercial | Loans and Finance Receivables, Traditional | Multifamily |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,654,272 |  | 1,689,943
Commercial | Loans and Finance Receivables, Traditional | Multifamily | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 0 |  | 0
Commercial | Loans and Finance Receivables, Traditional | Multifamily | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 0 |  | 0
Commercial | Loans and Finance Receivables, Traditional | Multifamily | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,118 |  | 0
Commercial | Loans and Finance Receivables, Traditional | Multifamily | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,118 |  | 0
Commercial | Loans and Finance Receivables, Traditional | Multifamily | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,653,154 |  | 1,689,943
Commercial | Loans and Finance Receivables, Traditional | SBA |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 56,600 |  | 68,137
Commercial | Loans and Finance Receivables, Traditional | SBA | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 273 |  | 287
Commercial | Loans and Finance Receivables, Traditional | SBA | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 481 |  | 0
Commercial | Loans and Finance Receivables, Traditional | SBA | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 7,193 |  | 10,299
Commercial | Loans and Finance Receivables, Traditional | SBA | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 7,947 |  | 10,586
Commercial | Loans and Finance Receivables, Traditional | SBA | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 48,653 |  | 57,551
Commercial | Loans and Finance Receivables, Traditional | Construction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 262,715 |  | 243,553
Commercial | Loans and Finance Receivables, Traditional | Construction | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 0 |  | 0
Commercial | Loans and Finance Receivables, Traditional | Construction | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 0 |  | 0
Commercial | Loans and Finance Receivables, Traditional | Construction | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 0 |  | 0
Commercial | Loans and Finance Receivables, Traditional | Construction | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 0 |  | 0
Commercial | Loans and Finance Receivables, Traditional | Construction | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 262,715 |  | 243,553
Consumer | Single family residential mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,782,655 | $ 1,800,000 | 1,920,806
Consumer | Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 88,494 |  | 86,988
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,782,655 |  | 1,920,806
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 25,437 |  | 36,338
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 16,064 |  | 5,068
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 20,702 |  | 19,431
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 62,203 |  | 60,837
Consumer | Loans and Finance Receivables, Traditional | Single family residential mortgage | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 1,720,452 |  | 1,859,969
Consumer | Loans and Finance Receivables, Traditional | Other consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 88,494 |  | 86,988
Consumer | Loans and Finance Receivables, Traditional | Other consumer | 30 - 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 454 |  | 163
Consumer | Loans and Finance Receivables, Traditional | Other consumer | 60 - 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 50 |  | 16
Consumer | Loans and Finance Receivables, Traditional | Other consumer | Greater than 89 Days Past due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 145 |  | 81
Consumer | Loans and Finance Receivables, Traditional | Other consumer | Total Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | 649 |  | 260
Consumer | Loans and Finance Receivables, Traditional | Other consumer | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable | $ 87,845 |  | $ 86,728

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