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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Receivable (Details) $ in Thousands | Mar. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 7,451,573 | $ 7,251,480 |  |
Allowance for loan losses | (93,226) | (92,584) |  |
Loans receivable, net | 7,358,347 | 7,158,896 |  |
Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | (98,631) | (98,189) | $ (82,713) | $ (84,213)
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 2,799,457 | 2,668,984 |  |
Commercial | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,163,381 | 1,311,105 |  |
Commercial | Multifamily |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,397,761 | 1,361,054 |  |
Commercial | SBA |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 133,116 | 205,548 |  |
Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 225,153 | 181,841 |  |
Commercial | Warehouse lending balances |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,570,000 | 1,600,000 |  |
Commercial | PPP loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 58,300 | $ 123,100 |  |
Number of loans | loan | 226 | 397 |  |
Deferred loan costs/(fees) and premiums/(discounts), net | $ 203 | $ 772 |  |
Consumer | Single family residential mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,637,307 | 1,420,023 |  |
Consumer | Other consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 95,398 | $ 102,925 |  |

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