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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Individually Evaluated Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | $ 5,898,405 | $ 5,951,885
Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 36,684 |
Commercial and industrial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 10,457 |
Commercial real estate | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 4,654 |
Multifamily | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
SBA | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 3,596 |
Construction | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Single family residential mortgage | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 17,820 |
Other consumer | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 157 |
Commercial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 8,485 |
Commercial | Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 2,088,308 | 1,691,270
Commercial | Commercial and industrial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 5,492 |
Commercial | Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 807,195 | 818,817
Commercial | Commercial real estate | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 2,644 |
Commercial | Multifamily |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 1,289,820 | 1,494,528
Commercial | Multifamily | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Commercial | SBA |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 273,444 | 70,981
Commercial | SBA | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 349 |
Commercial | Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 176,016 | $ 231,350
Commercial | Construction | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Commercial | Single family residential mortgage | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Commercial | Other consumer | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Residential | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 20,484 |
Residential | Commercial and industrial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Residential | Commercial real estate | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 2,010 |
Residential | Multifamily | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Residential | SBA | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 497 |
Residential | Construction | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Residential | Single family residential mortgage | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 17,820 |
Residential | Other consumer | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 157 |
Business Assets | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 7,715 |
Business Assets | Commercial and industrial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 4,965 |
Business Assets | Commercial real estate | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Business Assets | Multifamily | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Business Assets | SBA | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 2,750 |
Business Assets | Construction | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Business Assets | Single family residential mortgage | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | 0 |
Business Assets | Other consumer | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Loans receivable | $ 0 |

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