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Allowance for credit losses - Allowance for loan losses - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable          
Troubled debt restructurings $ 1,640,640,000   $ 1,640,640,000   $ 1,656,822,000
Allowance for loan and leases losses reduction $ (11,000,000)        
Reversion window 3 years 1 year      
Note A / B Split          
Financing Receivable          
Troubled debt restructurings $ 2,700,000 $ 10,200,000 2,700,000 $ 10,200,000  
Aggregated unpaid principal balance 2,700,000 $ 10,200,000 2,700,000 10,200,000  
Loans restructuring charge offs     $ 0 $ 0  
Number of loans     3 5  
Commercial          
Financing Receivable          
Troubled debt restructurings 324,552,000   $ 324,552,000   326,088,000
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings $ 9,000,000   $ 9,000,000   $ 9,000,000