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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 35 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Affordable Housing Fund Investment |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Alternative investments unfunded investment commitments | $ 11,100 |  | $ 11,100 |  | $ 11,100 |
Small Business Investment Companies |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Alternative investments unfunded investment commitments | 7,600 |  | 7,600 |  | 7,600 |
Other Investments |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Alternative investments unfunded investment commitments | 501 |  | 501 |  | 501 |
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Maximum commitment |  |  |  |  |  | $ 100,000
Related party term of contract |  | 15 years |  |  |  |
Advertising and promotion expense | 1,700 | $ 1,700 | 3,300 | $ 3,300 |  |
Payments for naming rights |  |  |  |  | 18,000 |
Prepaid commitment balance, net of amortization | $ 8,000 |  | $ 8,000 |  | $ 8,000 |

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