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Summary of significant accounting policies - Estimated Useful Lives of Related Assets (Detail) | 12 Months Ended
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Dec. 31, 2014
Minimum [Member] | Premises and Leasehold Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, estimated useful life | 7 years
Minimum [Member] | Furniture, Fixtures and Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, estimated useful life | 3 years
Maximum [Member] | Premises and Leasehold Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, estimated useful life | 40 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, plant and equipment, estimated useful life | 10 years

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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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