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LOANS AND ALLOWANCE FOR LOAN LOSSES - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 6,719,570 | $ 7,700,873 |  | $ 7,036,004 |  |
Allowance for loan and lease losses | (59,523) | (62,192) | $ (63,885) | (56,678) | $ (54,763) | $ (49,333)
Loans and leases receivable, net | $ 6,660,047 | $ 7,638,681 |  |  |  |
Percentage to total loans and leases (percent) | 100.00% | 100.00% |  |  |  |
NTM Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 6,719,570 | $ 7,700,873 |  |  |  |
Deferred loan costs/(fees) and premiums/(discounts), net | 16,100 | 17,700 |  |  |  |
Traditional Loans and Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 5,972,304 | 6,874,142 |  |  |  |
Traditional Loans and Leases | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 209,029 | 203,976 |  |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,951,707 | 1,944,142 |  | 1,742,559 |  |
Allowance for loan and lease losses | (21,529) | (18,191) | (18,893) | (16,864) | (17,571) | (14,280)
Commercial | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 856,497 | 867,013 |  | 793,855 |  |
Allowance for loan and lease losses | (6,877) | (6,674) | (6,838) | (5,732) | (5,417) | (4,971)
Commercial | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,598,978 | 2,241,246 |  | 1,959,965 |  |
Allowance for loan and lease losses | (12,625) | (17,970) | (18,898) | (14,630) | (14,219) | (13,265)
Commercial | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 80,929 | 68,741 |  | 78,092 |  |
Allowance for loan and lease losses | (3,120) | (1,827) | (3,057) | (1,840) | (1,577) | (1,701)
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 209,029 | 203,976 |  | 211,110 |  |
Allowance for loan and lease losses | (3,715) | (3,461) | $ (3,453) | $ (3,419) | $ (3,220) | $ (3,318)
Commercial | Traditional Loans and Leases | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,951,707 | 1,944,142 |  |  |  |
Commercial | Traditional Loans and Leases | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 856,497 | 867,013 |  |  |  |
Commercial | Traditional Loans and Leases | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,598,978 | 2,241,246 |  |  |  |
Commercial | Traditional Loans and Leases | SBA |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 80,929 | 68,741 |  |  |  |
Commercial | Traditional Loans and Leases | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 209,029 | 203,976 |  |  |  |
Consumer | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,961,065 | 2,305,490 |  |  |  |
Consumer | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 61,365 | 70,265 |  |  |  |
Consumer | NTM Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 747,266 | 826,731 |  |  |  |
Consumer | NTM Loans | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 745,019 | 824,318 |  |  |  |
Consumer | NTM Loans | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 2,247 | 2,413 |  |  |  |
Consumer | Traditional Loans and Leases | Single family residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,216,046 | 1,481,172 |  |  |  |
Consumer | Traditional Loans and Leases | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 59,118 | $ 67,852 |  |  |  |

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