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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 33 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019
Other Commitments [Line Items] |  |  |  |
Commitments to make loans period, maximum |  | 30 days |  |
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights |  |  |  |
Other Commitments [Line Items] |  |  |  |
Maximum commitment | $ 100,000,000.0 |  |  |
Related party term of contract | 15 years |  |  |
Advertising and promotion expense |  | $ 6,700,000 | $ 6,700,000 |
Payments for naming rights |  |  |  | $ 20,800,000
Prepaid recognized as prepaid asset |  | 7,400,000 |  | 7,400,000
Affordable Housing Fund Investment |  |  |  |
Other Commitments [Line Items] |  |  |  |
Unfunded commitments |  | 22,400,000 |  | 22,400,000
Small Business Investment Companies |  |  |  |
Other Commitments [Line Items] |  |  |  |
Unfunded commitments |  | 7,600,000 |  | 7,600,000
Other Alternative Investments |  |  |  |
Other Commitments [Line Items] |  |  |  |
Unfunded commitments |  | 501,000 |  | 501,000
Banc home loans | Discontinued Operations | Commitments to extend credit |  |  |  |
Other Commitments [Line Items] |  |  |  |
Commitments to extend credit |  | $ 0 | $ 0 | $ 0

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