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Summary of significant accounting policies - Premises and equipment, net (Details)
Dec. 31, 2023
Minimum | Premises and leasehold improvements  
Premises and equipment, net  
Property, plant and equipment, estimated useful life 7 years
Minimum | Furniture, fixtures and equipment  
Premises and equipment, net  
Property, plant and equipment, estimated useful life 3 years
Maximum | Premises and leasehold improvements  
Premises and equipment, net  
Property, plant and equipment, estimated useful life 40 years
Maximum | Furniture, fixtures and equipment  
Premises and equipment, net  
Property, plant and equipment, estimated useful life 10 years