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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 30 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019
Affordable Housing Fund Investment |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Alternative investments unfunded investment commitments | $ 22,700 |  |  | $ 22,700 |  | $ 22,700
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 |  | 5,000 | $ 5,000 |
Payments for naming rights |  |  |  |  |  | 19,400
Prepaid commitment balance, net of amortization | $ 7,700 |  |  | $ 7,700 |  | $ 7,700

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