Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on securities, tax expense (benefit)		$ 38	$ 415
Reclassification adjustment for gains included in net income, tax expense	$ 5	0	421
Accretion of unrealized loss on securities reclassified to held-to-maturity, tax expense		$ 562	$ 497