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FINANCIAL ASSETS AND FINANCIAL LIABILITIES - Transfers Between Level 1 and Level 2 (Details) - HKD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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FINANCIAL ASSETS AND FINANCIAL LIABILITIES |  |
Fair value asset transferred from level 1 to level 2 | $ 0 | $ 0

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References No definition available. + Details
Name: | futu_FairValueAssetsLevel1ToLevel2TransfersAmount1
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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