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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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The total expense recognized in the period for promotion, public relations, and brand or product advertising.

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