Premises and Equipment, Net - Components of Premises and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 518,349	$ 488,404
Accumulated depreciation and amortization	(239,734)	(222,929)
Total premises and equipment, net	278,615	265,475
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	67,342	57,630
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	190,582	189,782
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	71,944	64,191
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 188,481	$ 176,801

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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