Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on securities, tax expense (benefit)	$ 46	$ 207	$ 8	$ (50)
Accretion of unrealized loss on securities reclassified to held-to-maturity, tax expense	336	854	122	365
Reclassification adjustment for losses included in net income, tax benefit			$ 53	$ 0