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Regulatory capital requirements - Additional Information (Details)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Regulatory Capital Requirements under Banking Regulations    
Notes Receivable Gross $ 32,077,769,000 $ 29,240,557,000
Loans held-in-portfolio 32,372,925,000 29,506,225,000
Asset pledged as collateral    
Regulatory Capital Requirements under Banking Regulations    
Notes Receivable Gross 7,400,000,000 6,600,000,000
PPP    
Regulatory Capital Requirements under Banking Regulations    
Loans held-in-portfolio 38,000,000 $ 353,000,000
PPPL | Asset pledged as collateral    
Regulatory Capital Requirements under Banking Regulations    
Notes Receivable Gross $ 0  
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