Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]
Stock issued for employee stock purchase plan, shares (in shares)			60,413	39,782
Stock issued for compensation plans, shares (in shares)	23,199	14,245	206,176	226,715
Stock issued for acquisition (in shares)			3,999,623
Cash dividends per share (in dollars per share)	$ 0.16	$ 0.15	$ 0.48	$ 0.45