Premises and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Premises and Equipment, Net, by Type [Abstract]
Premises and Equipment, gross	$ 322,992	$ 311,872
Less accumulated depreciation and amortization	180,410	169,583
Premises and equipment, net	142,582	142,289
Land [Member]
Premises and Equipment, Net, by Type [Abstract]
Premises and Equipment, gross	39,724	39,653
Building and Leasehold Improvements [Member]
Premises and Equipment, Net, by Type [Abstract]
Premises and Equipment, gross	155,506	151,690
Furniture and Equipment [Member]
Premises and Equipment, Net, by Type [Abstract]
Premises and Equipment, gross	$ 127,762	$ 120,529

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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