Consolidated Statements of Income and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Tax expense (benefit) from unrealized holding gain (loss) on securities arising during period	$ (482)	$ 1,487	$ (2,982)	$ 1,382
Tax expense (benefit) from reclassification adjustment from AOCI for sale of securities arising during period	0	13	8	13
Tax expense (benefit) from unrealized gain (loss) on cash flow hedges arising during period	$ 17	$ (58)	$ 92	$ (35)