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Regulatory Capital - Schedule of Regulatory Capital Ratio (Details)
Sep. 30, 2023
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Basel III Minimums, Total risk-based capital 0.0800
Basel III Minimums, Tier 1 risk-based capital 0.0600
Basel III Minimums, Common equity Tier 1 0.0450
Basel III Minimums, Tier 1 leverage 0.0400
Basel III Requirements, Total risk-based capital 0.1050
Basel III Requirements, Tier 1 risk-based capital 0.0850
Basel III Requirements, Common equity Tier 1 0.0700
Basel III Requirements, Tier 1 leverage 0.0400