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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 22, 2016 | Mar. 31, 2017 | Sep. 30, 2017
Other Commitments [Line Items] |  |  |
Commitments to make loans, period, maximum |  |  | 30 days
Commitments to sell loans under residential mortgage division |  |  | $ 0
Alternative investments unfunded investment commitments |  |  | 96,700,000
Accrued litigation liability |  |  | 5,900,000
Affordable Housing Fund Investment |  |  |
Other Commitments [Line Items] |  |  |
Alternative investments unfunded investment commitments |  |  | 16,200,000
Small Business Investment Companies |  |  |
Other Commitments [Line Items] |  |  |
Alternative investments unfunded investment commitments |  |  | 10,900,000
Other Investments |  |  |
Other Commitments [Line Items] |  |  |
Alternative investments unfunded investment commitments |  |  | 97,200,000
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights |  |  |
Other Commitments [Line Items] |  |  |
Maximum commitment |  | $ 100,000,000 |
Related party term of contract | 15 years | 15 years |
Payments for naming rights |  | $ 10,000,000 | 10,000,000
SFR mortgage loan sale commitments |  |  |
Other Commitments [Line Items] |  |  |
Commitments to sell loans under residential mortgage division |  |  | $ 15,100,000

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