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Summary of significant accounting policies - Useful lives (Details 2)	12 Months Ended
	Dec. 31, 2022
Buildings | Minimum
Premises and equipment disclosures
Property, Plant and Equipment, Useful Life	40 years
Buildings | Maximum
Premises and equipment disclosures
Property, Plant and Equipment, Useful Life	67 years
Building improvements | Minimum
Premises and equipment disclosures
Property, Plant and Equipment, Useful Life	5 years
Building improvements | Maximum
Premises and equipment disclosures
Property, Plant and Equipment, Useful Life	10 years
Other leasehold improvements | Maximum
Premises and equipment disclosures
Property, Plant and Equipment, Useful Life	10 years
Rented premises improvements | Maximum
Premises and equipment disclosures
Property, Plant and Equipment, Useful Life	10 years
Other tangible fixed assets | Minimum
Premises and equipment disclosures
Property, Plant and Equipment, Useful Life	3 years
Other tangible fixed assets | Maximum
Premises and equipment disclosures
Property, Plant and Equipment, Useful Life	10 years
Capitalized software | Maximum
Premises and equipment disclosures
Property, Plant and Equipment, Useful Life	7 years

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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