Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands		Common stock	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Total
Beginning Balance (in shares) at Dec. 31, 2018		10,780
Beginning balance at Dec. 31, 2018		$ 88,484	$ 50,161	$ (157)		$ 138,488
Increase (Decrease) in Stockholders' Equity
Net income			23,653			23,653
Other comprehensive income (loss), net of tax				311		311
Dividends on common stock		$ 117	(3,372)			(3,255)
Common stock issued and related tax effects (1) (in shares)	[1]	101
Common stock issued and related tax effects (1)	[1]	$ 1,512				1,512
Ending Balance (in shares) at Dec. 31, 2019		10,881
Ending balance at Dec. 31, 2019		$ 90,113	70,442	154		160,709
Increase (Decrease) in Stockholders' Equity
Net income			23,644			23,644
Other comprehensive income (loss), net of tax				(1,343)		(1,343)
Dividends on common stock		$ 119	(3,417)			(3,298)
Common stock issued and related tax effects (1) (in shares)	[1]	80
Common stock issued and related tax effects (1)	[1]	$ 1,641				1,641
Treasury stock purchased, at cost					$ (7,442)	$ (7,442)
Treasury stock purchased, at cost (in shares)		(505)
Ending Balance (in shares) at Dec. 31, 2020		10,456				10,456
Ending balance at Dec. 31, 2020		$ 91,873	90,669	(1,189)	(7,442)	$ 173,911
Increase (Decrease) in Stockholders' Equity
Net income			36,119			36,119
Other comprehensive income (loss), net of tax				1,511		1,511
Dividends on common stock		$ 134	(3,751)			(3,617)
Common stock issued and related tax effects (1) (in shares)	[1]	134
Common stock issued and related tax effects (1)	[1]	$ 1,996				1,996
Treasury stock purchased, at cost					(4,191)	$ (4,191)
Treasury stock purchased, at cost (in shares)		(199)
Ending Balance (in shares) at Dec. 31, 2021		10,391				10,391
Ending balance at Dec. 31, 2021		$ 94,003	$ 123,037	$ 322	$ (11,633)	$ 205,729

[1] Includes the issuance of common stock under employee benefit plans, which includes nonqualified stock options and restricted stock expense related entries, employee option exercises and the tax benefit of options exercised.