Office Properties and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 59,310,000	$ 60,098,000
Less accumulated depreciation	23,857,000	22,411,000
Property, plant and equipment, net	35,453,000	37,687,000
Depreciation	2,600,000	3,000,000	3,100,000
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,225,000	5,225,000
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35,947,000	35,618,000
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	65,000	65,000
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 18,073,000	$ 19,190,000