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Intangible Assets and Goodwill - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Weighted-average life	6 years 6 months
Customer Related Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average life	8 years 9 months 18 days
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average life	5 years 10 months 24 days
Mortgage Servicing Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted-average life	2 years 3 months 18 days

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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