Premises and Equipment - Premises and equipment - (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total cost	$ 16,983	$ 18,290
Accumulated depreciation and amortization	(7,276)	(7,515)
Net	9,707	10,775
Land
Property, Plant and Equipment [Line Items]
Total cost	2,484	2,694
Buildings
Property, Plant and Equipment [Line Items]
Total cost	8,016	8,860
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total cost	1,037	722
Equipment
Property, Plant and Equipment [Line Items]
Total cost	5,446	5,849
Construction in progress
Property, Plant and Equipment [Line Items]
Total cost		$ 165