Allowance for credit losses - loans held-in-portfolio - Schedule of Financial effect of the modifications made to borrowers experiencing financial difficulties (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Mortgage \| Interest rate reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Reduced weighted average contractual interest rate before modification	7.10%	7.00%	7.20%	6.80%
Reduced weighted average contractual interest rate after modification	5.60%	5.40%	5.50%	5.50%
Mortgage \| Term extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	12 years	12 years	13 years	13 years
Mortgage \| Other than insignificant payment delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	28 months	20 months	28 months	20 months
Commercial \| Commercial real estate Non-owner occupied \| Term extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	4 months	2 years	6 months	2 years
Commercial \| Commercial real estate Non-owner occupied \| Other than insignificant payment delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	8 months	13 months	8 months	13 months
Commercial \| Commercial real estate Owner occupied \| Interest rate reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Reduced weighted average contractual interest rate before modification	10.30%		10.30%
Reduced weighted average contractual interest rate after modification	9.00%		9.00%
Commercial \| Commercial real estate Owner occupied \| Term extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	8 months	17 months	20 months	17 months
Commercial \| Commercial real estate Owner occupied \| Other than insignificant payment delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	11 months	14 months	11 months	10 months
Commercial \| Commercial and industrial \| Interest rate reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Reduced weighted average contractual interest rate before modification	18.90%	22.70%	20.40%	24.30%
Reduced weighted average contractual interest rate after modification	8.40%	9.90%	8.90%	9.70%
Commercial \| Commercial and industrial \| Term extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	5 months	10 months	11 months	17 months
Commercial \| Commercial and industrial \| Other than insignificant payment delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	16 months	11 months	11 months	11 months
Consumer \| Credit cards \| Interest rate reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Reduced weighted average contractual interest rate before modification	20.60%	20.80%	20.90%	21.00%
Reduced weighted average contractual interest rate after modification	8.30%	7.90%	8.60%	8.20%
Consumer \| Credit cards \| Other than insignificant payment delay
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	17 months	17 months	17 months	18 months
Consumer \| Personal \| Interest rate reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Reduced weighted average contractual interest rate before modification	20.30%	20.90%	20.10%	21.30%
Reduced weighted average contractual interest rate after modification	11.40%	11.10%	11.70%	11.50%
Consumer \| Personal \| Term extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	5 years	5 years	4 years	5 years
Consumer \| Auto \| Interest rate reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Reduced weighted average contractual interest rate before modification	11.20%		10.00%	18.30%
Reduced weighted average contractual interest rate after modification	11.10%		9.80%	18.29%
Consumer \| Auto \| Term extension
Financing Receivable, Allowance for Credit Loss [Line Items]
Weighted average life of loans	21 months	19 months	20 months	2 years
Consumer \| Other \| Interest rate reduction
Financing Receivable, Allowance for Credit Loss [Line Items]
Reduced weighted average contractual interest rate before modification		18.30%		18.00%
Reduced weighted average contractual interest rate after modification		18.29%		0.00%

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Financing Receivables, Modified, Weighted-Average Interest Rate before Modification

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of increase in weighted-average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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