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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 7,156,206 |  | $ 7,115,038 |  |  |
Allowance for loan losses | (80,883) |  | (85,960) |  |  |
Loans receivable, net | 7,075,323 |  | 7,029,078 |  |  |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | (84,888) | $ (89,365) | (91,265) | $ (99,698) | $ (98,631) | $ (98,189)
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 2,000,408 |  | 1,845,960 |  |  |
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,266,438 |  | 1,259,651 |  |  |
Commercial | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,654,152 |  | 1,689,943 |  |  |
Commercial | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 62,898 |  | 68,137 |  |  |
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 264,684 |  | 243,553 |  |  |
Commercial | Warehouse Lending Balances |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 786,100 |  | 602,500 |  |  |
Consumer | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,820,721 |  | 1,920,806 |  |  |
Consumer | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 86,905 |  | $ 86,988 |  |  |

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