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Regulatory & Capital Matters (Details)
 9 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Regulatory & Capital Matters    
Tier 1 capital leverage ratio (as a percent) 0.1121 0.113
Risk-based capital ratio (as a percent) 0.151 0.1554
Subsidiaries    
Regulatory & Capital Matters    
Tier 1 capital leverage ratio (as a percent) 0.1145 0.109
Risk-based capital ratio (as a percent) 0.1439 0.1382
Tier One leverage ratio, basis point increase (as a percent) 0.55%  
Risk-based capital ratio, basis point increase (as a percent) 0.57%  
Minimum | Subsidiaries    
Regulatory & Capital Matters    
Tier 1 capital leverage ratio (as a percent) 0.08  
Risk-based capital ratio (as a percent) 0.12  
Tier 1 capital leverage ratio, board-designated threshold 8.00%  
Total Capital Ratio, board-designated threshold (as a percent) 12.00%