Office Properties and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Office properties and equipment, net
Office properties and equipment, gross	$ 5,491	$ 5,569
Less accumulated depreciation	(3,012)	(2,999)
Office properties and equipment, net	2,479	2,570
Depreciation expense	251	238
Rent expense	566	559
Land
Office properties and equipment, net
Office properties and equipment, gross	572	572
Office buildings and improvements
Office properties and equipment, net
Office properties and equipment, gross	3,114	3,254
Furniture, fixtures and equipment
Office properties and equipment, net
Office properties and equipment, gross	$ 1,805	$ 1,743