Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on securities, tax expense (benefit)	$ (1)	$ 44	$ (34)	$ 37
Accretion of unrealized loss on securities reclassified to held-to-maturity, tax expense	$ 128	$ 244	$ 128	277
Reclassification adjustment for losses included in net income, tax benefit				$ 5