Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Dividends declared per share	$ 0.22		$ 0.20		$ 0.22	$ 0.20
Unearned compensation expense on stock grants	$ 641		$ 558	$ 608	$ 641	$ 558
Shares issued under employee stock purchase plan, shares	1,038	1,289	712	894
Purchase treasury stock, shares		40,000
Purchased treasury stock, price per share		$ 18.00
Director [Member]
Common stock grants, shares		12,757		10,799
Officer [Member]
Common stock grants, shares		19,453
Unearned compensation expense on stock grants		$ 639