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Allowance for credit losses - Allowance for loan losses - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Financing Receivable, Modifications [Line Items]          
Troubled debt restructurings $ 1,644,647,000     $ 1,644,647,000 $ 1,656,822,000
Allowance for loan and leases losses reduction (11,000,000)        
Reversion window   3 years 1 year    
Commercial Loans          
Financing Receivable, Modifications [Line Items]          
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings 12,000,000     12,000,000 9,000,000
Note A / B Split          
Financing Receivable, Modifications [Line Items]          
Aggregated unpaid principal balance $ 2,700,000     2,700,000 10,200,000
Loans restructuring charge offs       $ 0 $ 0
Number of loans       3 5