Premises, Plant and Equipment, Net (Components Of Premises And Equipment) (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 488,404,000	$ 473,254,000
Accumulated depreciation and amortization	(222,929,000)	(207,684,000)
Premises and equipment, net	265,475,000	265,570,000
Depreciation and amortization	16,400,000	15,800,000	15,300,000
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	57,630,000	56,837,000
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	189,782,000	184,404,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	64,191,000	62,050,000
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 176,801,000	$ 169,963,000

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, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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