Premises and Equipment (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Depreciation and amortization of premises and equipment, year to date	$ 22.5	$ 21.8	$ 21.8