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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | $ 35,534 | $ 41,629 |
Current | 7,217,759 | 6,617,778 |
Total ending loan balances | 7,253,293 | 6,659,407 | $ 6,226,897
30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 14,238 | 22,830 |
60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 6,027 | 9,257 |
Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 15,269 | 9,542 |
NTM Loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 834,301 | 806,933 |
Traditional Loans and Leases |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 29,198 | 29,519 |
Current | 6,389,794 | 5,822,955 |
Total ending loan balances | 6,418,992 | 5,852,474 |
Traditional Loans and Leases | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 7,902 | 13,770 |
Traditional Loans and Leases | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 6,027 | 7,378 |
Traditional Loans and Leases | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 15,269 | 8,371 |
Traditional Loans and Leases | Construction |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 200,294 | 182,960 |
Consumer | Single family residential mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 2,300,069 | 2,055,649 |
Consumer | Other consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 72,998 | 106,579 |
Consumer | NTM Loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 6,336 | 12,110 |
Current | 827,965 | 794,823 |
Total ending loan balances | 834,301 | 806,933 |
Consumer | NTM Loans | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 6,336 | 9,060 |
Consumer | NTM Loans | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 1,879 |
Consumer | NTM Loans | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 1,171 |
Consumer | NTM Loans | Single family residential mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 6,079 | 12,110 |
Current | 825,090 | 791,245 |
Total ending loan balances | 831,169 | 803,355 |
Consumer | NTM Loans | Single family residential mortgage | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 6,079 | 9,060 |
Consumer | NTM Loans | Single family residential mortgage | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 1,879 |
Consumer | NTM Loans | Single family residential mortgage | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 1,171 |
Consumer | NTM Loans | Other consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 257 | 0 |
Current | 2,875 | 3,578 |
Total ending loan balances | 3,132 | 3,578 |
Consumer | NTM Loans | Other consumer | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 257 | 0 |
Consumer | NTM Loans | Other consumer | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Consumer | NTM Loans | Other consumer | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Consumer | Traditional Loans and Leases | Single family residential mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 17,745 | 16,244 |
Current | 1,451,155 | 1,236,050 |
Total ending loan balances | 1,468,900 | 1,252,294 |
Consumer | Traditional Loans and Leases | Single family residential mortgage | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 3,933 | 6,862 |
Consumer | Traditional Loans and Leases | Single family residential mortgage | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 2,549 | 3,370 |
Consumer | Traditional Loans and Leases | Single family residential mortgage | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 11,263 | 6,012 |
Consumer | Traditional Loans and Leases | Other consumer |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 709 | 3,699 |
Current | 69,157 | 99,302 |
Total ending loan balances | 69,866 | 103,001 |
Consumer | Traditional Loans and Leases | Other consumer | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 442 | 3,194 |
Consumer | Traditional Loans and Leases | Other consumer | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 4 | 413 |
Consumer | Traditional Loans and Leases | Other consumer | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 263 | 92 |
Commercial | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 1,673,055 | 1,701,951 | 1,602,805
Commercial | Commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 823,193 | 717,415 | 713,120
Commercial | Multifamily |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 2,112,190 | 1,816,141 | 1,617,890
Commercial | SBA |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 71,494 | 78,699 | 78,604
Commercial | Construction |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 200,294 | 182,960 | 176,397
Commercial | Lease financing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 0 | 13 | $ 91
Commercial | NTM Loans | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 0 | 0 |
Commercial | NTM Loans | Commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 0 | 0 |
Commercial | NTM Loans | Multifamily |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 0 | 0 |
Commercial | NTM Loans | SBA |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 0 | 0 |
Commercial | NTM Loans | Construction |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 0 | 0 |
Commercial | NTM Loans | Lease financing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total ending loan balances | 0 | 0 |
Commercial | Traditional Loans and Leases | Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 7,989 | 4,679 |
Current | 1,665,066 | 1,697,272 |
Total ending loan balances | 1,673,055 | 1,701,951 |
Commercial | Traditional Loans and Leases | Commercial and industrial | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 2,074 | 136 |
Commercial | Traditional Loans and Leases | Commercial and industrial | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 2,960 | 3,595 |
Commercial | Traditional Loans and Leases | Commercial and industrial | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 2,955 | 948 |
Commercial | Traditional Loans and Leases | Commercial real estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Current | 823,193 | 717,415 |
Total ending loan balances | 823,193 | 717,415 |
Commercial | Traditional Loans and Leases | Commercial real estate | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Commercial real estate | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Commercial real estate | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Multifamily |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Current | 2,112,190 | 1,816,141 |
Total ending loan balances | 2,112,190 | 1,816,141 |
Commercial | Traditional Loans and Leases | Multifamily | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Multifamily | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Multifamily | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | SBA |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 1,816 | 4,897 |
Current | 69,678 | 73,802 |
Total ending loan balances | 71,494 | 78,699 |
Commercial | Traditional Loans and Leases | SBA | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 514 | 3,578 |
Commercial | Traditional Loans and Leases | SBA | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 514 | 0 |
Commercial | Traditional Loans and Leases | SBA | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 788 | 1,319 |
Commercial | Traditional Loans and Leases | Construction |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 939 | 0 |
Current | 199,355 | 182,960 |
Total ending loan balances | 200,294 | 182,960 |
Commercial | Traditional Loans and Leases | Construction | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 939 | 0 |
Commercial | Traditional Loans and Leases | Construction | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Construction | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due | 0 | 0 |
Commercial | Traditional Loans and Leases | Lease financing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due |  | 0 |
Current |  | 13 |
Total ending loan balances | $ 0 | 13 |
Commercial | Traditional Loans and Leases | Lease financing | 30 - 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due |  | 0 |
Commercial | Traditional Loans and Leases | Lease financing | 60 - 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due |  | 0 |
Commercial | Traditional Loans and Leases | Lease financing | Greater than 89 Days Past due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due |  | $ 0 |

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