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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 7,036,004 |  | $ 6,659,407 | $ 5,956,337 |  |
Allowance for loan and lease losses | (56,678) | $ (54,763) | (49,333) | (42,385) | $ (42,736) | $ (40,444)
Loans and leases receivable, net | 6,979,326 |  | 6,610,074 |  |  |
NTM Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 818,876 |  | 806,933 |  |  |
Traditional Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 6,217,128 |  | 5,852,474 |  |  |
Traditional Loans and Leases | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 211,110 |  | 182,960 |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 1,742,559 |  | 1,701,951 | 1,560,916 |  |
Allowance for loan and lease losses | (16,864) | (17,571) | (14,280) | (10,495) | (10,888) | (7,584)
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 793,855 |  | 717,415 | 716,771 |  |
Allowance for loan and lease losses | (5,732) | (5,417) | (4,971) | (5,126) | (4,543) | (5,467)
Commercial | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 1,959,965 |  | 1,816,141 | 1,545,888 |  |
Allowance for loan and lease losses | (14,630) | (14,219) | (13,265) | (10,686) | (11,029) | (11,376)
Commercial | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 78,092 |  | 78,699 | 77,254 |  |
Allowance for loan and lease losses | (1,840) | (1,577) | (1,701) | (1,084) | (1,146) | (939)
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 211,110 |  | 182,960 | 156,246 |  |
Allowance for loan and lease losses | (3,419) | (3,220) | (3,318) | (2,974) | (3,018) | (2,015)
Commercial | Lease financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 0 |  | 13 | 173 |  |
Allowance for loan and lease losses | 0 | $ 0 | 0 | $ (3) | $ (5) | $ (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 | 1,742,559 |  | 1,701,951 |  |  |
Commercial | Traditional Loans and Leases | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 793,855 |  | 717,415 |  |  |
Commercial | Traditional Loans and Leases | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 1,959,965 |  | 1,816,141 |  |  |
Commercial | Traditional Loans and Leases | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 78,092 |  | 78,699 |  |  |
Commercial | Traditional Loans and Leases | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 211,110 |  | 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 | 2,174,183 |  | 2,055,649 |  |  |
Consumer | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 76,240 |  | 106,579 |  |  |
Consumer | NTM Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 818,876 |  | 806,933 |  |  |
Consumer | NTM Loans | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 815,374 |  | 803,355 |  |  |
Consumer | NTM Loans | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 3,502 |  | 3,578 |  |  |
Consumer | Traditional Loans and Leases | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 1,358,809 |  | 1,252,294 |  |  |
Consumer | Traditional Loans and Leases | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 72,738 |  | $ 103,001 |  |  |

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