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Regulatory Requirements - Risk-Based Regulatory Capital Ratio Requirements (Details)
Sep. 30, 2025
Dec. 31, 2024
CET1 capital ratio    
Regulatory Minimum (as a percent) 0.045  
Standardized (as a percent) 13.50% 13.50%
Advanced (as a percent) 0.100 0.100
Tier 1 capital ratio    
Regulatory Minimum (as a percent) 0.060  
Standardized (as a percent) 0.150 0.150
Advanced (as a percent) 0.115 0.115
Total capital ratio    
Regulatory Minimum (as a percent) 0.080  
Standardized (as a percent) 0.170 0.170
Advanced (as a percent) 0.135 0.135