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RELATED-PARTY TRANSACTIONS - LAFC Financing (Details) - USD ($)		3 Months Ended	9 Months Ended	12 Months Ended
	Aug. 22, 2016	Mar. 31, 2017	Sep. 30, 2017	Dec. 31, 2032	Dec. 31, 2031	Dec. 31, 2030	Dec. 31, 2029	Dec. 31, 2028	Dec. 31, 2027	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Aug. 08, 2016
Related Party Transaction [Line Items]
Deposits			$ 7,403,593,000																$ 9,142,150,000
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights
Related Party Transaction [Line Items]
Related party term of contract	15 years	15 years
Related party renewal term of contract	10 years
Future annual payments for naming rights, revenue rights and other sponsorship rights		$ 10,000,000	10,000,000
Los Angeles Football Club (LAFC) Naming Rights, Revenue Rights, And Other Sponsorship Rights | Scenario, Forecast
Related Party Transaction [Line Items]
Future annual payments for naming rights, revenue rights and other sponsorship rights				$ 6,700,000	$ 6,600,000	$ 6,500,000	$ 6,400,000	$ 6,300,000	$ 6,200,000	$ 6,100,000	$ 6,000,000	$ 5,900,000	$ 5,800,000	$ 5,700,000	$ 5,600,000	$ 5,500,000	$ 5,400,000	$ 5,300,000
Stadco Loan | Immediate Family Member of Chief Executive Officer, Brother | Los Angeles Football Club (LAFC)
Related Party Transaction [Line Items]
Committed line of credit																				$ 40,300,000
Committed line of credit, maximum borrowing																				145,000,000
Outstanding advances			15,100,000																0
Largest amount of principal outstanding			15,100,000
Unused loan fees			277,000																59,000
Interest income			121,000																0
Team Loan | Immediate Family Member of Chief Executive Officer, Brother | Los Angeles Football Club (LAFC)
Related Party Transaction [Line Items]
Committed line of credit																				9,700,000
Committed line of credit, maximum borrowing																				$ 35,000,000
Outstanding advances			3,500,000																0
Largest amount of principal outstanding			3,500,000
Unused loan fees			84,000																18,000
Interest income			43,000																0
Various Entities Affiliated With LAFC | Affiliated Entity
Related Party Transaction [Line Items]
Deposits			$ 53,600,000																$ 76,000,000

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