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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 22, 2016 | Mar. 31, 2017 | Jun. 30, 2017
Other Commitments [Line Items] |  |  |
Commitments to make loans, period, maximum |  |  | 30 days
Commitments to sell loans under residential mortgage division |  |  | $ 207.8
Alternative investments unfunded investment commitments |  |  | 111.7
Affordable Housing Fund Investment |  |  |
Other Commitments [Line Items] |  |  |
Alternative investments unfunded investment commitments |  |  | 18.4
Small Business Investment Companies |  |  |
Other Commitments [Line Items] |  |  |
Alternative investments unfunded investment commitments |  |  | 11.8
Other Investments |  |  |
Other Commitments [Line Items] |  |  |
Alternative investments unfunded investment commitments |  |  | 111.7
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights |  |  |
Other Commitments [Line Items] |  |  |
Maximum commitment |  | $ 100.0 |
Related party term of contract | 15 years | 15 years |
Payments for naming rights |  | $ 10.0 | 10.0
Jumbo SFR mortgage loan sale commitments |  |  |
Other Commitments [Line Items] |  |  |
Commitments to sell loans under residential mortgage division |  |  | 103.5
TBAs commitments |  |  |
Other Commitments [Line Items] |  |  |
Commitments to sell loans under residential mortgage division |  |  | 198.0
Best efforts commitments |  |  |
Other Commitments [Line Items] |  |  |
Commitments to sell loans under residential mortgage division |  |  | 9.8
Interest rate lock commitments |  |  |
Other Commitments [Line Items] |  |  |
Commitments to sell loans under residential mortgage division |  |  | $ 24.4

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