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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Receivable (Details) $ in Thousands | Sep. 30, 2021 USD ($) loan | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) loan | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 6,228,575 |  | $ 5,898,405 |  |  |
Allowance for loan losses | (73,524) |  | (81,030) |  |  |
Loans receivable, net | 6,155,051 |  | 5,817,375 |  |  |
Deferred loan costs/(fees) and premiums/(discounts), net | 12,500 |  | 6,200 |  |  |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan losses | (78,757) | $ (79,699) | (84,213) | $ (94,133) | $ (94,565) | $ (61,713)
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 2,296,626 |  | 2,088,308 |  |  |
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 907,224 |  | 807,195 |  |  |
Commercial | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,295,613 |  | 1,289,820 |  |  |
Commercial | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 181,582 |  | 273,444 |  |  |
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 130,536 |  | 176,016 |  |  |
Commercial | Warehouse lending balances |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,520,000 |  | 1,340,000 |  |  |
Commercial | PPP loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 116,500 |  | $ 210,000 |  |  |
Number of loans | loan | 566 |  | 949 |  |  |
Deferred loan costs/(fees) and premiums/(discounts), net | $ 2,000 |  | $ 1,600 |  |  |
Consumer | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,393,696 |  | 1,230,236 |  |  |
Consumer | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 23,298 |  | $ 33,386 |  |  |

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