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v3.26.1

INTEREST EXPENSES (Details) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 HKD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 HKD ($) | Dec. 31, 2023 HKD ($)
INTEREST EXPENSES |  |  |  |
Interest expenses for securities borrowed | $ 1,459,895 |  | $ 1,373,662 | $ 737,777
Interest expenses for margin financing | 279,113 |  | 239,987 | 171,582
Interest expenses for other businesses | 18,844 |  | 3,801 | 1,400
Total | $ 1,757,852 | $ 225,849 | $ 1,617,450 | $ 910,759

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- Definition The amount of interest expenses for margin financing. + References No definition available. + Details
Name: | futu_InterestExpensesForMarginFinancing
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of interest expense from borrowing from other businesses for IPO financing services + References No definition available. + Details
Name: | futu_InterestExpensesForOtherBusinesses
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of interest expenses for securities borrowed. + References No definition available. + Details
Name: | futu_InterestExpensesForSecuritiesBorrowed
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition This element represents interest incurred for borrowed money which was used to produce goods or render services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_FinancingInterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InterestExpenseOperatingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration