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Premises and Equipment (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Property	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 7.1	$ 2.8	$ 0.1
Number of purchased banking centers	26
Banking Center Premises [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment increase	$ 34.1

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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