Consolidated Statements of Income and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Tax expense (benefit) from unrealized holding gain (loss) on securities arising during period	$ 966	$ (1,481)	$ 2,348	$ 4,160
Tax expense (benefit) from reclassification adjustment from AOCI for sale of securities arising during period	0	0	13	33
Tax expense (benefit) from unrealized gain (loss) on cash flow hedges arising during period	$ 14	$ 130	$ (21)	$ (306)