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PROCESSING AND SERVICING COSTS (Details) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2025 HKD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 HKD ($) | Dec. 31, 2023 HKD ($)
PROCESSING AND SERVICING COSTS |  |  |  |
Cloud service fee | $ 259,483 |  | $ 209,573 | $ 181,241
Market information and data fee | 155,351 |  | 125,068 | 82,026
System cost | 69,768 |  | 75,812 | 58,709
Data transmission fee | 60,306 |  | 57,365 | 44,718
Others | 33,551 |  | 18,965 | 9,210
Total | $ 578,459 | $ 74,321 | $ 486,783 | $ 375,904

X
- Definition The amount of expense in the period for cloud service fee. + References No definition available. + Details
Name: | futu_CloudServiceFee
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense in the period for data transmission fee. + References No definition available. + Details
Name: | futu_DataTransmissionFee
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense in the period for market information and data fee. + References No definition available. + Details
Name: | futu_MarketInformationAndDataFee
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of cost related to other processing and servicing. + References No definition available. + Details
Name: | futu_OtherProcessingAndServicingCosts
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense during the period paid for market information, cloud service, data transmission and etc. + References No definition available. + Details
Name: | futu_ProcessingAndServicingCosts
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | futu_ProcessingAndServicingCostsAbstract
Namespace Prefix: | futu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expense in the period for system costs. + References No definition available. + Details
Name: | futu_SystemCost
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration