Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended				42 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020
Dividend declared per share	$ 0.30		$ 0.22
Unearned compensation expense on stock grants	$ 637	$ 698	$ 641		$ 641
Shares issued under employee stock purchase plan, shares	713	807	1,038	1,289
Purchase treasury stock, shares	9,400	25,000		40,000
Purchased treasury stock, price per share	$ 19.60	$ 16.65		$ 18.00
Director [Member]
Common stock grants, shares		12,009		12,757
Officer [Member]
Common stock grants, shares				19,453
Unearned compensation expense on stock grants				$ 639
Employee Stock Purchase Plan [Member]
Shares issued under employee stock purchase plan, shares					16,781