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Financial risk management objectives and policies - Additional Information (Detail) - HKD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Profit Loss Before Tax | $ 1,361,698,473 | $ 1,331,176,555 | $ 1,001,420,217
Derivative financial instrument charged to profit or loss | 484,760,273 | 54,008,047 |
Ariana Capital Investment Limited [member] | Derivative Financial Assets [member] |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Credit risk exposure of derivative financial instruments | $ 1,305,256,317 | $ 969,894,519 |
Investment F [member] | Unlisted Equity Shares And Unlisted Debt Securities [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Concentration risk percentage | 0.00% | 65.00% |
Investment H [Member] | Unlisted Equity Shares And Unlisted Debt Securities [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Concentration risk percentage | 97.00% | 28.00% |
Listed Equity Shares [Member] | Bank of Qingdao Co Ltd [member] |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Stock Loan Percent | 81.00% | 100.00% |
Price Risk [member] |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Percentage Of Increase Decrease In Market Value Of Financial Assets At FVTPL | 5.00% | 5.00% |
Profit Loss Before Tax | $ 43,073,000 | $ 52,770,000 |
Price Risk [member] | Unlisted Equity Shares And Unlisted Debt Securities [Member] |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Percentage Of Increase Decrease In Market Value Of Financial Assets At FVTPL | 5.00% | 5.00% |
Profit Loss Before Tax | $ 27,922,000 | $ 86,531,000 |
Credit risk [member] |  |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |  |
Fair value of securities pledged | $ 3,781,638,616 | $ 3,089,570,978 |

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