Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) on securities, tax expense (benefit)	$ (33)	$ (204)	$ (221)
Reclassification adjustment for gains included in net income, tax expense	53	0
Accretion of unrealized loss on securities reclassified to held-to-maturity, tax expense	$ 1,186	$ 480	$ 556