Foreclosed Assets Foreclosed Assets (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Foreclosed Assets Valuation Allowance	$ 14	$ 12,696	$ 10,246	$ 12,123
Provision for losses on foreclosed assets	2,138	2,576	5,228
Foreclosed Assets, Valuation Allowance, Reductions Related to Sales	$ (14,820)	$ (126)	$ (7,105)