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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		30 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Affordable Housing Fund Investment
Other Commitments [Line Items]
Alternative investments unfunded investment commitments	$ 22,700			$ 22,700		$ 22,700
Small Business Investment Companies
Other Commitments [Line Items]
Alternative investments unfunded investment commitments	7,600			7,600		7,600
Other Investments
Other Commitments [Line Items]
Alternative investments unfunded investment commitments	501			501		501
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights
Other Commitments [Line Items]
Maximum commitment			$ 100,000
Related party term of contract			15 years
Advertising and promotion expense	1,700	$ 1,700		5,000	$ 5,000
Payments for naming rights						19,400
Prepaid commitment balance, net of amortization	$ 7,700			$ 7,700		$ 7,700

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