Premises and Equipment - Additional Information (Detail) (USD $)	6 Months Ended		6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Jun. 30, 2011 Office Building Sold	Apr. 26, 2011 Office Building Sold
Property, Plant and Equipment [Line Items]
Premises and equipment, net	$ 119,049,000		$ 133,362,000		$ 14,600,000
Proceeds from sales of premises and equipment	14,396,000			14,400,000
Net loss (gain) on dispositions of premises and equipment	$ (270,000)	$ 13,000		$ (253,000)

The gains (losses) included in results of operations resulting from the sale or disposal of property, plant and equipment, which do not qualify for treatment as discontinued operations. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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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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