Premises and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 497,086	$ 468,810
Less: Accumulated depreciation and amortization	(269,363)	(256,536)
Premises and equipment, net	227,723	212,274
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	37,245	37,669
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	270,480	258,653
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	172,263	160,424
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 17,098	$ 12,064

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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