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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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