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Other Operating Expenses - Schedule of operating expenses and foreign exchange differences included in the consolidated statement of profit or loss and other comprehensive income (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Premises costs and office utilities      
Advertising and marketing service fees and brand promotional expenses $ 20,004,385 $ 597,566 $ 5,696,606
—Premises costs 13,095,944 14,226,081 14,244,127
—Office utilities 9,142,411 7,821,627 6,601,790
Premises costs and office utilities 22,238,355 22,047,708 20,845,917
Traveling and business development expenses 7,761,633 3,747,166 5,636,354
Commissions and bank charges 1,309,186 1,308,425 1,957,433
Office and maintenance expenses 20,729 55,192 175,348
Administrative service, management and investment advisory fees 29,802,500 24,330,000 24,330,000
Legal and professional fees      
Legal and professional related fees 73,729,042 24,663,025 36,314,507
Staff recruitment expenses 4,229,736 2,322,035 1,223,673
Staff welfare and staff recruitment expenses      
—Depreciation 96,115 44,226 30,374
—Amortization 5,688,143    
—Foreign exchange differences, net 1,970,158 963,422 3,222,789
—Other expenses 11,722,482 3,715,247 4,290,210
Other expenses, by nature 19,476,898 4,722,895 7,543,373
Operating expenses $ 178,572,464 $ 83,794,012 $ 103,723,211