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SIGNIFICANT ACCOUNTING POLICIES - Significant Risks and Uncertainties (Details) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2025 HKD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 HKD ($)
SIGNIFICANT ACCOUNTING POLICIES |  |  |
Stock-pledged loans, Gross | $ 65,121,642 |  | $ 49,799,748
Increase in basis points | 1.00% |  |
Pre-tax income | $ 844,100 | $ 108.5 |
Other advances | Asset Pledged as Collateral |  |  |
SIGNIFICANT ACCOUNTING POLICIES |  |  |
Stock-pledged loans, Gross | $ 1,907,756 |  | $ 1,907,250
Credit Concentration Risk | Notes Receivable | Borrower of the group |  |  |
SIGNIFICANT ACCOUNTING POLICIES |  |  |
Percentage of stock-pledged loans | 95.99% | 95.99% | 95.91%
China, Yuan Renminbi |  |  |
SIGNIFICANT ACCOUNTING POLICIES |  |  |
Net liabilities | $ 8,404,600 |  | $ 6,586,900
Estimated depreciation of renminbi against the U.S. dollar (as a percent) | 10.00% |  | 10.00%
Increase in pre tax income | $ 840,500 |  | $ 658,700
Estimated appreciation of renminbi against the U.S. dollar (as a percent) | 10.00% |  | 10.00%
Decrease in pre tax income | $ 840,500 |  | $ 658,700

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