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LOANS AND ALLOWANCE FOR LOAN LOSSES - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 6,383,259 |  | $ 7,700,873 | $ 7,253,293 |  |
Allowance for loan and lease losses | (62,927) | $ (59,523) | (62,192) | (57,782) | $ (56,678) | $ (49,333)
Loans and leases receivable, net | 6,320,332 |  | 7,638,681 |  |  |
NTM Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 6,383,259 |  | 7,700,873 |  |  |
Deferred loan costs/(fees) and premiums/(discounts), net | 15,300 |  | 17,700 |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,789,478 |  | 1,944,142 | 1,673,055 |  |
Allowance for loan and lease losses | (24,575) | (21,529) | (18,191) | (16,543) | (16,864) | (14,280)
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 891,029 |  | 867,013 | 823,193 |  |
Allowance for loan and lease losses | (6,579) | (6,877) | (6,674) | (6,012) | (5,732) | (4,971)
Commercial | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,563,757 |  | 2,241,246 | 2,112,190 |  |
Allowance for loan and lease losses | (11,965) | (12,625) | (17,970) | (15,473) | (14,630) | (13,265)
Commercial | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 75,359 |  | 68,741 | 71,494 |  |
Allowance for loan and lease losses | (4,118) | (3,120) | (1,827) | (1,870) | (1,840) | (1,701)
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 228,561 |  | 203,976 | 200,294 |  |
Allowance for loan and lease losses | (3,880) | $ (3,715) | (3,461) | $ (3,247) | $ (3,419) | $ (3,318)
Consumer | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,775,953 |  | 2,305,490 |  |  |
Consumer | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 59,122 |  | 70,265 |  |  |
Consumer | NTM Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 653,475 |  | 826,731 |  |  |
Consumer | NTM Loans | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 651,167 |  | 824,318 |  |  |
Consumer | NTM Loans | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 2,308 |  | $ 2,413 |  |  |

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