Goodwill and Other Intangible Assets Narrative Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 27, 2011
Goodwill And Intangible Assets [Line Items]
Goodwill at Acquisition				$ 2,200
Core Deposit Intangible at Acquisition				$ 1,700
Amortization of core deposit intangible	$ 171	$ 171	$ 171