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TAXATION - Movement of Valuation Allowance (Details) - HKD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Movement of Valuation Allowance |  |  |
Balance at beginning of the year | $ 352,716 | $ 188,205 | $ 122,624
Additions | 92,233 | 209,900 | 77,016
Reversals | (39,064) | (45,389) | (11,435)
Balance at end of the year | $ 405,885 | $ 352,716 | $ 188,205

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | futu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of valuation allowance, deferred tax asset, additions. + References No definition available. + Details
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Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of valuation allowance, deferred tax asset, reversals. + References No definition available. + Details
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Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant