Investment Securities Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Gain (Loss) on Investments [Line Items]
Proceeds	$ 6,620	$ 11,540	$ 7,420
Gross gains	131	66	393
Gross losses	(60)	(13)	(78)
Net gains	$ 71	$ 53	$ 315