Securities, Gains (Loss) on Sales of Securities, Securities Pledged, and Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Securities [Abstract]
Net gains (loss) on sales and calls of AFS securities	$ 522	$ (106)	$ (211)
Realized pre-tax gain on sale of securities	529
Pre-tax loss on sale of securities	7
Securities pledged as collateral to secure public deposit and for other purposes	221,200	228,200
Amortized cost of securities sold under agreements to repurchase	$ 303,500	$ 285,500