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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Details) - USD ($) $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Aug. 22, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Commitments [Line Items] |  |  |  |  |
Commitments to make loans period, maximum |  |  | 30 days |  |
Unfunded commitments |  |  | $ 50.1 |  |
Affordable Housing Fund Investment |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Unfunded commitments |  |  | $ 15.6 | $ 11.0 | $ 50.6
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 |  |

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