Office Buildings and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Office Building and Equipment [Line Items]
Total cost	$ 20,908	$ 20,765
Accumulated depreciation	(12,364)	(11,696)
Net book value	8,544	9,069
Land [Member]
Office Building and Equipment [Line Items]
Total cost	2,895	2,895
Office Buildings and Improvements [Member]
Office Building and Equipment [Line Items]
Total cost	13,309	13,207
Furniture and Equipment [Member]
Office Building and Equipment [Line Items]
Total cost	$ 4,704	$ 4,663

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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