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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 22, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017
Other Commitments [Line Items] |  |  |  |  |  |
Commitments to make loans, period, maximum |  |  |  | 30 days |  |
Affordable Housing Fund Investment |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Alternative investments unfunded investment commitments |  |  |  | $ 13,600 |  |
Small Business Investment Companies |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Alternative investments unfunded investment commitments |  |  |  | 10,100 |  |
Other Investments |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Alternative investments unfunded investment commitments |  |  |  | 501 |  |
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Maximum commitment |  |  |  |  | $ 100,000 | $ 100,000
Related party term of contract | 15 years | 15 years |  |  |  |
Payments for naming rights |  |  | $ 10,000 | 14,000 |  |
Prepaid commitment balance, net of amortization |  |  |  | $ 9,000 |  |

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