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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 7,253,293 |  | $ 6,659,407 | $ 6,226,897 |  |
Allowance for loan and lease losses | (57,782) | $ (56,678) | (49,333) | (45,072) | $ (42,385) | $ (40,444)
Loans and leases receivable, net | 7,195,511 |  | 6,610,074 |  |  |
NTM Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 834,301 |  | 806,933 |  |  |
Traditional Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 6,418,992 |  | 5,852,474 |  |  |
Traditional Loans and Leases | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 200,294 |  | 182,960 |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 1,673,055 |  | 1,701,951 | 1,602,805 |  |
Allowance for loan and lease losses | (16,543) | (16,864) | (14,280) | (12,500) | (10,495) | (7,584)
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 823,193 |  | 717,415 | 713,120 |  |
Allowance for loan and lease losses | (6,012) | (5,732) | (4,971) | (5,328) | (5,126) | (5,467)
Commercial | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 2,112,190 |  | 1,816,141 | 1,617,890 |  |
Allowance for loan and lease losses | (15,473) | (14,630) | (13,265) | (11,274) | (10,686) | (11,376)
Commercial | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 71,494 |  | 78,699 | 78,604 |  |
Allowance for loan and lease losses | (1,870) | (1,840) | (1,701) | (1,297) | (1,084) | (939)
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 200,294 |  | 182,960 | 176,397 |  |
Allowance for loan and lease losses | (3,247) | (3,419) | (3,318) | (3,212) | (2,974) | (2,015)
Commercial | Lease financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 0 |  | 13 | 91 |  |
Allowance for loan and lease losses | 0 | $ 0 | 0 | $ (2) | $ (3) | $ (6)
Commercial | NTM Loans | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 0 |  | 0 |  |  |
Commercial | NTM Loans | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 0 |  | 0 |  |  |
Commercial | NTM Loans | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 0 |  | 0 |  |  |
Commercial | NTM Loans | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 0 |  | 0 |  |  |
Commercial | NTM Loans | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 0 |  | 0 |  |  |
Commercial | NTM Loans | Lease financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 0 |  | 0 |  |  |
Commercial | Traditional Loans and Leases | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 1,673,055 |  | 1,701,951 |  |  |
Commercial | Traditional Loans and Leases | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 823,193 |  | 717,415 |  |  |
Commercial | Traditional Loans and Leases | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 2,112,190 |  | 1,816,141 |  |  |
Commercial | Traditional Loans and Leases | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 71,494 |  | 78,699 |  |  |
Commercial | Traditional Loans and Leases | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 200,294 |  | 182,960 |  |  |
Commercial | Traditional Loans and Leases | Lease financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 0 |  | 13 |  |  |
Consumer | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 2,300,069 |  | 2,055,649 |  |  |
Consumer | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 72,998 |  | 106,579 |  |  |
Consumer | NTM Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 834,301 |  | 806,933 |  |  |
Consumer | NTM Loans | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 831,169 |  | 803,355 |  |  |
Consumer | NTM Loans | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 3,132 |  | 3,578 |  |  |
Consumer | Traditional Loans and Leases | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 1,468,900 |  | 1,252,294 |  |  |
Consumer | Traditional Loans and Leases | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 69,866 |  | $ 103,001 |  |  |

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