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Office Properties and Equipment, Net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 306	$ 501
Carrying amount of building sold	6,612	8,894
Gain on sale of office properties and equipment	2,523	0
Rent expense under operating lease	373	252
Office Building
Property, Plant and Equipment [Line Items]
Carrying amount of building sold	1,700
Gain on sale of office properties and equipment	$ 2,523

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

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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