Premises and Equipment (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Premises and equipment, net
Premises and equipment, gross	$ 115,943,000	$ 113,377,000
Accumulated depreciation and amortization	(63,218,000)	(59,614,000)
Premises and equipment, net	52,725,000	53,763,000
Depreciation and amortization expense
Depreciation and amortization expense	3,800,000	3,300,000	3,600,000
Land [Member]
Premises and equipment, net
Premises and equipment, gross	14,615,000	14,638,000
Buildings and Improvements [Member]
Premises and equipment, net
Premises and equipment, gross	51,538,000	50,889,000
Furniture and Equipment [Member]
Premises and equipment, net
Premises and equipment, gross	48,275,000	46,239,000
Leasehold Improvements [Member]
Premises and equipment, net
Premises and equipment, gross	$ 1,515,000	$ 1,611,000

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 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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