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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Aug. 22, 2016	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Commitments [Line Items]
Commitments to make loans, period, maximum				30 days
Affordable Housing Fund Investment
Other Commitments [Line Items]
Alternative investments unfunded investment commitments				$ 14,000
Small Business Investment Companies
Other Commitments [Line Items]
Alternative investments unfunded investment commitments				10,700
Other Investments
Other Commitments [Line Items]
Alternative investments unfunded investment commitments				501
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights
Other Commitments [Line Items]
Maximum commitment		$ 100,000			$ 100,000
Related party term of contract	15 years	15 years
Payments for naming rights			$ 10,000	12,700
Prepaid commitment balance, net of amortization				$ 9,300

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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