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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Receivable (Details) $ in Thousands | Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | $ 7,251,480 | $ 5,898,405 |  |  |
Allowance for loan losses | (92,584) | (81,030) | $ (57,649) |  |
Loans receivable, net | 7,158,896 | 5,817,375 |  |  |
Commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses | (98,189) | (84,213) |  | $ (61,713) | $ (66,814)
Single family residential mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment |  | 1,230,236 |  |  |
Other consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment |  | 33,386 |  |  |
Commercial | Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | 2,668,984 | 2,088,308 |  |  |
Allowance for loan losses |  |  | (22,353) |  |
Commercial | Commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | 1,311,105 | 807,195 |  |  |
Allowance for loan losses |  |  | (5,941) |  |
Commercial | Multifamily |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | 1,361,054 | 1,289,820 |  |  |
Allowance for loan losses |  |  | (11,405) |  |
Commercial | SBA |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | 205,548 | 273,444 |  |  |
Allowance for loan losses |  |  | (3,120) |  |
Commercial | Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | 181,841 | 176,016 |  |  |
Allowance for loan losses |  |  | (3,906) |  |
Commercial | CARES Act |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | $ 123,100 | $ 210,000 |  |  |
Financing receivable, number of loans | loan | 397 | 949 |  |  |
Commercial | Warehouse Lending Receivables |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | $ 1,600,000 | $ 1,340,000 |  |  |
Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | 7,251,480 |  |  |  |
Consumer | Single family residential mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | 1,420,023 | 1,230,236 |  |  |
Allowance for loan losses |  |  | (10,486) |  |
Consumer | Other consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total recorded investment | $ 102,925 | $ 33,386 |  |  |
Allowance for loan losses |  |  | $ (438) |  |

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