Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands		Common stock	Retained earnings	Accumulated other comprehensive (loss) income	Treasury stock	Total
Beginning Balance (in shares) at Dec. 31, 2019		10,881
Beginning balance at Dec. 31, 2019		$ 90,113	$ 70,442	$ 154		$ 160,709
Increase (Decrease) in Stockholders' Equity
Net income			5,368			5,368
Other comprehensive income (loss), net of tax				(986)		(986)
Dividends on common stock		$ 30	(871)			(841)
Common stock issued & related tax effects (1) (in shares)	[1]	13
Common stock issued & related tax effects (1)	[1]	$ 227				227
Acquisition of treasury stock, at cost					$ (172)	(172)
Acquisition of treasury stock, at cost (in shares)		(11)
Ending Balance (in shares) at Mar. 31, 2020		10,883
Ending balance at Mar. 31, 2020		$ 90,370	74,939	(832)	(172)	164,305
Beginning Balance (in shares) at Dec. 31, 2019		10,881
Beginning balance at Dec. 31, 2019		$ 90,113	70,442	154		160,709
Increase (Decrease) in Stockholders' Equity
Net income						16,299
Other comprehensive income (loss), net of tax				(1,427)		(1,427)
Ending Balance (in shares) at Sep. 30, 2020		10,570
Ending balance at Sep. 30, 2020		$ 91,474	84,168	(1,273)	(5,135)	169,234
Beginning Balance (in shares) at Mar. 31, 2020		10,883
Beginning balance at Mar. 31, 2020		$ 90,370	74,939	(832)	(172)	164,305
Increase (Decrease) in Stockholders' Equity
Net income			5,171			5,171
Other comprehensive income (loss), net of tax				74		74
Dividends on common stock		$ 29	(857)			(828)
Common stock issued & related tax effects (1) (in shares)	[1]	45
Common stock issued & related tax effects (1)	[1]	$ 704				704
Acquisition of treasury stock, at cost					(2,819)	(2,819)
Acquisition of treasury stock, at cost (in shares)		(200)
Ending Balance (in shares) at Jun. 30, 2020		10,728
Ending balance at Jun. 30, 2020		$ 91,103	79,253	(758)	(2,991)	166,607
Increase (Decrease) in Stockholders' Equity
Net income			5,760			5,760
Other comprehensive income (loss), net of tax				(515)		(515)
Dividends on common stock		$ 29	(845)			(816)
Common stock issued & related tax effects (1) (in shares)	[1]	4
Common stock issued & related tax effects (1)	[1]	$ 342				342
Acquisition of treasury stock, at cost					(2,144)	(2,144)
Acquisition of treasury stock, at cost (in shares)		(162)
Ending Balance (in shares) at Sep. 30, 2020		10,570
Ending balance at Sep. 30, 2020		$ 91,474	84,168	(1,273)	(5,135)	$ 169,234
Beginning Balance (in shares) at Dec. 31, 2020		10,456				10,456
Beginning balance at Dec. 31, 2020		$ 91,873	90,669	(1,189)	(7,442)	$ 173,911
Increase (Decrease) in Stockholders' Equity
Net income			8,496			8,496
Other comprehensive income (loss), net of tax				655		655
Dividends on common stock		$ 30	(834)			(804)
Common stock issued & related tax effects (1) (in shares)	[1]	36
Common stock issued & related tax effects (1)	[1]	$ 277				277
Acquisition of treasury stock, at cost					(1,349)	(1,349)
Acquisition of treasury stock, at cost (in shares)		(70)
Ending Balance (in shares) at Mar. 31, 2021		10,422
Ending balance at Mar. 31, 2021		$ 92,180	98,331	(534)	(8,791)	$ 181,186
Beginning Balance (in shares) at Dec. 31, 2020		10,456				10,456
Beginning balance at Dec. 31, 2020		$ 91,873	90,669	(1,189)	(7,442)	$ 173,911
Increase (Decrease) in Stockholders' Equity
Net income						26,373
Other comprehensive income (loss), net of tax				1,257		$ 1,257
Ending Balance (in shares) at Sep. 30, 2021		10,363				10,363
Ending balance at Sep. 30, 2021		$ 93,409	114,337	68	(11,547)	$ 196,267
Beginning Balance (in shares) at Mar. 31, 2021		10,422
Beginning balance at Mar. 31, 2021		$ 92,180	98,331	(534)	(8,791)	181,186
Increase (Decrease) in Stockholders' Equity
Net income			8,418			8,418
Other comprehensive income (loss), net of tax				337		337
Dividends on common stock		$ 33	(938)			(905)
Common stock issued & related tax effects (1) (in shares)	[1]	34
Common stock issued & related tax effects (1)	[1]	$ 597				597
Acquisition of treasury stock, at cost					(877)	(877)
Acquisition of treasury stock, at cost (in shares)		(40)
Ending Balance (in shares) at Jun. 30, 2021		10,416
Ending balance at Jun. 30, 2021		$ 92,810	105,811	(197)	(9,668)	188,756
Increase (Decrease) in Stockholders' Equity
Net income			9,459			9,459
Other comprehensive income (loss), net of tax				265		265
Dividends on common stock		$ 34	(933)			(899)
Common stock issued & related tax effects (1) (in shares)	[1]	32
Common stock issued & related tax effects (1)	[1]	$ 565				565
Acquisition of treasury stock, at cost					(1,879)	$ (1,879)
Acquisition of treasury stock, at cost (in shares)		(85)
Ending Balance (in shares) at Sep. 30, 2021		10,363				10,363
Ending balance at Sep. 30, 2021		$ 93,409	$ 114,337	$ 68	$ (11,547)	$ 196,267

[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.