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Regulatory capital requirements - Additional Information (Details)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Regulatory Capital Requirements under Banking Regulations    
Loans held-in-portfolio $ 35,420,879,000 $ 32,372,925,000
PPPL | Asset pledged as collateral    
Regulatory Capital Requirements under Banking Regulations    
Loans held-in-portfolio 0  
SBA loans under PPP program    
Regulatory Capital Requirements under Banking Regulations    
Loans held-in-portfolio $ 9,200,000 $ 38,000,000
Standardized approach | Basel III    
Regulatory Capital Requirements under Banking Regulations    
CET 1 minimum ratio required ratio 0.065  
Tier one risk based capital required for capital adequacy ratio 0.08  
Capital required for capital adequacy ratio 0.10  
Leverage ratio required 0.05