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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Risk Categories for Loans and Leases (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 7,253,293 | $ 6,659,407 | $ 6,226,897
Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 7,118,475 | 6,578,813 |
Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 58,942 | 39,770 |
Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 75,596 | 40,718 |
Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 280 | 106 |
NTM Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 834,301 | 806,933 |
Traditional Loans and Leases |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 6,418,992 | 5,852,474 |
Traditional Loans and Leases | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 6,288,256 | 5,774,646 |
Traditional Loans and Leases | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 57,366 | 38,175 |
Traditional Loans and Leases | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 73,090 | 39,547 |
Traditional Loans and Leases | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 280 | 106 |
Traditional Loans and Leases | Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 200,294 | 182,960 |
Consumer | Single family residential mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,300,069 | 2,055,649 |
Consumer | Other consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 72,998 | 106,579 |
Consumer | NTM Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 834,301 | 806,933 |
Consumer | NTM Loans | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 830,219 | 804,167 |
Consumer | NTM Loans | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,576 | 1,595 |
Consumer | NTM Loans | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,506 | 1,171 |
Consumer | NTM Loans | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Consumer | NTM Loans | Single family residential mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 831,169 | 803,355 |
Consumer | NTM Loans | Single family residential mortgage | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 827,087 | 800,589 |
Consumer | NTM Loans | Single family residential mortgage | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,576 | 1,595 |
Consumer | NTM Loans | Single family residential mortgage | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,506 | 1,171 |
Consumer | NTM Loans | Single family residential mortgage | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Consumer | NTM Loans | Other consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 3,132 | 3,578 |
Consumer | NTM Loans | Other consumer | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 3,132 | 3,578 |
Consumer | NTM Loans | Other consumer | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Consumer | NTM Loans | Other consumer | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Consumer | NTM Loans | Other consumer | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Consumer | Traditional Loans and Leases | Single family residential mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,468,900 | 1,252,294 |
Consumer | Traditional Loans and Leases | Single family residential mortgage | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,446,826 | 1,240,866 |
Consumer | Traditional Loans and Leases | Single family residential mortgage | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,969 | 2,282 |
Consumer | Traditional Loans and Leases | Single family residential mortgage | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 19,105 | 9,146 |
Consumer | Traditional Loans and Leases | Single family residential mortgage | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Consumer | Traditional Loans and Leases | Other consumer |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 69,866 | 103,001 |
Consumer | Traditional Loans and Leases | Other consumer | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 68,998 | 98,030 |
Consumer | Traditional Loans and Leases | Other consumer | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 404 | 422 |
Consumer | Traditional Loans and Leases | Other consumer | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 464 | 4,549 |
Consumer | Traditional Loans and Leases | Other consumer | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,673,055 | 1,701,951 | 1,602,805
Commercial | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 823,193 | 717,415 | 713,120
Commercial | Multifamily |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,112,190 | 1,816,141 | 1,617,890
Commercial | SBA |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 71,494 | 78,699 | 78,604
Commercial | Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 200,294 | 182,960 | 176,397
Commercial | Lease financing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 13 | $ 91
Commercial | NTM Loans | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | NTM Loans | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | NTM Loans | Multifamily |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | NTM Loans | SBA |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | NTM Loans | Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | NTM Loans | Lease financing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | Traditional Loans and Leases | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,673,055 | 1,701,951 |
Commercial | Traditional Loans and Leases | Commercial and industrial | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,600,534 | 1,651,628 |
Commercial | Traditional Loans and Leases | Commercial and industrial | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 34,482 | 33,376 |
Commercial | Traditional Loans and Leases | Commercial and industrial | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 38,039 | 16,947 |
Commercial | Traditional Loans and Leases | Commercial and industrial | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | Traditional Loans and Leases | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 823,193 | 717,415 |
Commercial | Traditional Loans and Leases | Commercial real estate | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 807,803 | 713,131 |
Commercial | Traditional Loans and Leases | Commercial real estate | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 11,320 | 0 |
Commercial | Traditional Loans and Leases | Commercial real estate | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 4,070 | 4,284 |
Commercial | Traditional Loans and Leases | Commercial real estate | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | Traditional Loans and Leases | Multifamily |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,112,190 | 1,816,141 |
Commercial | Traditional Loans and Leases | Multifamily | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 2,110,589 | 1,815,601 |
Commercial | Traditional Loans and Leases | Multifamily | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 540 |
Commercial | Traditional Loans and Leases | Multifamily | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 1,601 | 0 |
Commercial | Traditional Loans and Leases | Multifamily | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | Traditional Loans and Leases | SBA |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 71,494 | 78,699 |
Commercial | Traditional Loans and Leases | SBA | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 56,649 | 72,417 |
Commercial | Traditional Loans and Leases | SBA | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 4,754 | 1,555 |
Commercial | Traditional Loans and Leases | SBA | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 9,811 | 4,621 |
Commercial | Traditional Loans and Leases | SBA | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 280 | 106 |
Commercial | Traditional Loans and Leases | Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 200,294 | 182,960 |
Commercial | Traditional Loans and Leases | Construction | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 196,857 | 182,960 |
Commercial | Traditional Loans and Leases | Construction | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 3,437 | 0 |
Commercial | Traditional Loans and Leases | Construction | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | Traditional Loans and Leases | Construction | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | Traditional Loans and Leases | Lease financing |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 13 |
Commercial | Traditional Loans and Leases | Lease financing | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 13 |
Commercial | Traditional Loans and Leases | Lease financing | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | Traditional Loans and Leases | Lease financing | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | 0 | 0 |
Commercial | Traditional Loans and Leases | Lease financing | Doubtful |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loans | $ 0 | $ 0 |

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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