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FINANCIAL ASSETS AND FINANCIAL LIABILITIES - Transfers Between Level 1 and Level 2 (Details) - HKD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
FINANCIAL ASSETS AND FINANCIAL LIABILITIES |  |  |  |  |  |  |
Fair value asset transferred from level 1 to level 2 | $ 0 |  |  | $ 0 |  |  |
Fair value asset transferred from level 2 to level 1 | 0 |  |  | 0 |  |  |
Fair value liabilities transferred from level 1 to level 2 | 0 | $ 0 | $ 0 | 0 | $ 0 | $ 0 | $ 0
Fair value liabilities transferred from level 2 to level 1 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 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

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References No definition available. + Details
Name: | futu_FairValueAssetsLevel2ToLevel1TransfersAmount1
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References No definition available. + Details
Name: | futu_FairValueLiabilitiesLevel1ToLevel2TransfersAmount1
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References No definition available. + Details
Name: | futu_FairValueLiabilitiesLevel2ToLevel1TransfersAmount1
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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