Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on securities, tax expense (benefit)	$ (10)	$ (27)	$ 34	$ 10
Accretion of unrealized loss on securities reclassified to held-to-maturity, tax expense	$ 122	$ 365	$ 153	431
Reclassification adjustment for losses included in net income, tax benefit				$ 5