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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, 2018	Mar. 31, 2017	Sep. 30, 2018	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, 2017	Jun. 30, 2018	Nov. 24, 2017	Sep. 30, 2017	Aug. 08, 2016
Related Party Transaction [Line Items]
Deposits				$ 7,401,742,000																$ 7,292,903,000
Line of Credit | Los Angeles Football Club (LAFC) | Corporate Credit Card
Related Party Transaction [Line Items]
Line of credit facility				100,000
Letters of credit
Related Party Transaction [Line Items]
Letters of Credit outstanding																						$ 100,000
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	14,000,000
Maximum commitment																					$ 100,000,000		$ 100,000,000
Prepaid commitment balance, net of amortization				9,000,000
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
Los Angeles Football Club (LAFC) MLS Season
Related Party Transaction [Line Items]
Future annual payments for naming rights, revenue rights and other sponsorship rights				4,000,000
Los Angeles Football Club (LAFC) Advertising And Promotion Expense
Related Party Transaction [Line Items]
Future annual payments for naming rights, revenue rights and other sponsorship rights				5,000,000
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				0																23,300,000
Largest amount of principal outstanding				33,800,000																23,500,000
Unused loan fees				66,000																295,000
Interest income				1,100,000																325,000
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				9,700,000																5,400,000
Largest amount of principal outstanding				9,700,000																5,500,000
Unused loan fees				22,000																140,000
Interest income				269,000																83,000
Various Entities Affiliated With LAFC | Affiliated Entity
Related Party Transaction [Line Items]
Deposits				$ 42,200,000																$ 33,100,000

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