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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Receivable (Details) $ in Thousands | Sep. 30, 2022 USD ($) loan | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) loan | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 7,289,320 |  | $ 7,251,480 |  |  |
Allowance for loan losses | (92,444) |  | (92,584) |  |  |
Loans receivable, net | 7,196,876 |  | 7,158,896 |  |  |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | (98,849) | $ (99,698) | (98,189) | $ (78,757) | $ (79,699) | $ (84,213)
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,993,416 |  | 2,668,984 |  |  |
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,240,927 |  | 1,311,105 |  |  |
Commercial | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,698,455 |  | 1,361,054 |  |  |
Commercial | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 85,674 |  | 205,548 |  |  |
Commercial | Warehouse Lending Balances |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 766,400 |  | 1,600,000 |  |  |
Commercial | PPP loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 20,000 |  | $ 123,100 |  |  |
Number of loans | loan | 39 |  | 397 |  |  |
Consumer | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,947,652 |  | $ 1,420,023 |  |  |
Consumer | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 86,701 |  | $ 102,925 |  |  |

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