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 |