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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Receivable (Details) $ in Thousands | Jun. 30, 2022 USD ($) loan | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) loan | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 7,451,264 |  | $ 7,251,480 |  |  |
Allowance for loan losses | (93,793) |  | (92,584) |  |  |
Loans receivable, net | 7,357,471 |  | 7,158,896 |  |  |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | (99,698) | $ (98,631) | (98,189) | $ (79,699) | $ (82,713) | $ (84,213)
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 2,433,464 |  | 2,668,984 |  |  |
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,204,414 |  | 1,311,105 |  |  |
Commercial | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,572,308 |  | 1,361,054 |  |  |
Commercial | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 92,235 |  | 205,548 |  |  |
Commercial | Warehouse lending balances |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,160,000 |  | 1,600,000 |  |  |
Commercial | PPP loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 28,400 |  | $ 123,100 |  |  |
Number of loans | loan | 79 |  | 397 |  |  |
Consumer | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,832,279 |  | $ 1,420,023 |  |  |
Consumer | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 88,223 |  | $ 102,925 |  |  |

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