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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Loans Receivable (Details) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | $ 5,898,405 | $ 5,951,885 |  |  |
Allowance for loan losses | (81,030) | (57,649) | $ (57,649) |  |
Loans receivable, net | 5,817,375 | 5,894,236 |  |  |
Deferred loan origination costs/(fees) and premiums/(discounts), net | $ 6,200 | $ 14,300 |  |  |
Loan Portfolio | Loan Portfolio Concentration Risk |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage to total loans and leases (percent) | 100.00% | 100.00% |  |  |
Traditional Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | $ 5,461,292 | $ 5,351,229 |  |  |
Traditional Loans | Loan Portfolio | Loan Portfolio Concentration Risk |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage to total loans and leases (percent) | 92.60% | 89.90% |  |  |
NTM Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | $ 437,113 | $ 600,656 |  |  |
NTM Loans | Loan Portfolio | Loan Portfolio Concentration Risk |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Percentage to total loans and leases (percent) | 7.40% | 10.10% |  |  |
Commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Allowance for loan losses | $ (84,213) | $ (61,713) |  | $ (66,814) | $ (53,049)
Commercial | Commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 2,088,308 | 1,691,270 |  |  |
Allowance for loan losses |  |  | (22,353) |  |
Commercial | Commercial and industrial | Traditional Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 2,088,308 | 1,691,270 |  |  |
Commercial | Commercial and industrial | NTM Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 0 | 0 |  |  |
Commercial | Commercial real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 807,195 | 818,817 |  |  |
Allowance for loan losses |  |  | (5,941) |  |
Commercial | Commercial real estate | Traditional Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 807,195 | 818,817 |  |  |
Commercial | Commercial real estate | NTM Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 0 | 0 |  |  |
Commercial | Multifamily |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 1,289,820 | 1,494,528 |  |  |
Allowance for loan losses |  |  | (11,405) |  |
Commercial | Multifamily | Traditional Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 1,289,820 | 1,494,528 |  |  |
Commercial | Multifamily | NTM Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 0 | 0 |  |  |
Commercial | SBA |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 273,444 | 70,981 |  |  |
Allowance for loan losses |  |  | (3,120) |  |
Commercial | SBA | Traditional Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 273,444 | 70,981 |  |  |
Commercial | SBA | NTM Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 0 | 0 |  |  |
Commercial | Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 176,016 | 231,350 |  |  |
Allowance for loan losses |  |  | (3,906) |  |
Commercial | Construction | Traditional Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 176,016 | 231,350 |  |  |
Commercial | Construction | NTM Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 0 | 0 |  |  |
Commercial | CARES Act |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | $ 210,000 |  |  |  |
Financing receivable, number of loans | loan | 949 |  |  |  |
Deferred loan origination costs/(fees) and premiums/(discounts), net | $ 1,600 |  |  |  |
Consumer | NTM Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 437,113 | 600,656 |  |  |
Consumer | Single family residential mortgage |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 1,230,236 | 1,590,774 |  |  |
Allowance for loan losses |  |  | (10,486) |  |
Consumer | Single family residential mortgage | Traditional Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 794,721 | 992,417 |  |  |
Consumer | Single family residential mortgage | NTM Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 435,515 | 598,357 |  |  |
Consumer | Other consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 33,386 | 54,165 |  |  |
Allowance for loan losses |  |  | $ (438) |  |
Consumer | Other consumer | Traditional Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | 31,788 | 51,866 |  |  |
Consumer | Other consumer | NTM Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | $ 1,598 | $ 2,299 |  |  |

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