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Regulatory requirements (Details) | 9 Months Ended
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Sep. 30, 2025 USD ($)
Regulatory Capital Requirements [Line Items] |
Regulatory capital required to be maintained | $ 4,150,000
Oppenheimer |
Regulatory Capital Requirements [Line Items] |
Required percentage of net capital to aggregate customer-related debit items (as a percent) | 2.00%
Net capital | $ 383,000,000.0
Aggregate indebtedness (as a percent) | 24.43%
Excess capital | $ 351,700,000
Freedom |
Regulatory Capital Requirements [Line Items] |
Net capital | $ 3,400,000
Aggregate indebtedness (as a percent) | 6.67%
Freedom maintain net capital equal to the greater | $ 100,000
Net capital in excess of minimum required | $ 3,300,000
Oppenheimer Europe Ltd |
Regulatory Capital Requirements [Line Items] |
Common equity tier 1 ratio (as a percent) | 130.00%
Common equity tier 1 ratio required (as a percent) | 56.00%
Tier 1 capital ratio (as a percent) | 1.30
Tier 1 capital ratio required (as a percent) | 75.00%
Total capital ratio (as a percent) | 174.00%
Total capital ratio required (as a percent) | 100.00%
Oppenheimer Investments Asia Ltd. |
Regulatory Capital Requirements [Line Items] |
Net capital | $ 1,500,000
Excess liquid capital under hong kong SFC rules | 1,100,000
Regulatory capital required to be maintained | $ 385,582

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