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Premises and Equipment - Summary of Premises and Equipment and Applicable Depreciable Lives (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2014
Premises (40 Years) [Member]
Property, Plant and Equipment [Line Items]
Useful lives for all premises and equipment	40 years
Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives for all premises and equipment	3 years
Minimum [Member] | Furniture, Fixtures, and Equipment (3-7 Years) [Member]
Property, Plant and Equipment [Line Items]
Useful lives for all premises and equipment	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives for all premises and equipment	30 years
Maximum [Member] | Furniture, Fixtures, and Equipment (3-7 Years) [Member]
Property, Plant and Equipment [Line Items]
Useful lives for all premises and equipment	7 years

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- 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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