Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 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)	22,672	38,981	182,977	212,470
Stock issued for acquisition (in shares)	3,999,623		3,999,623
Cash dividends per share (in dollars per share)	$ 0.16	$ 0.15	$ 0.32	$ 0.30