Premises and Equipment, net - Summary of Premises and Equipment Balances (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 47,964	$ 47,562
Accumulated depreciation	(23,097)	(21,758)
Premises and equipment, net	24,867	25,804
Land [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	5,581	5,591
Building [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	19,531	19,497
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,309	4,644
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	12,580	12,147
Software [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	4,491	4,210
Bank automobiles [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	94	95
Capital lease asset [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, gross	$ 1,378	$ 1,378

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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