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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Details) - USD ($) $ in Thousands			12 Months Ended	28 Months Ended
	Mar. 31, 2017	Aug. 22, 2016	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Commitments to make loans period, maximum			30 days
Affordable Housing Fund Investment
Other Commitments [Line Items]
Unfunded commitments			$ 11,500	$ 11,500	$ 8,800	$ 501
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights
Other Commitments [Line Items]
Maximum commitment			100,000	100,000
Prepaid recognized as prepaid asset			$ 8,700	8,700
Related party term of contract		15 years	15 years
Payments for naming rights	$ 10,000		$ 5,300	$ 15,300

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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