Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning balance, shares at Dec. 31, 2022		29,271,915
Beginning balance at Dec. 31, 2022	$ 776,500	$ 157,784	$ 300,808	$ 428,637	$ (62,104)	$ (48,625)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	21,034			21,034
Other comprehensive income, net of income tax	6,554				6,554
Cash dividends declared	(6,151)			(6,151)
Stock-based compensation	1,030		1,057	(27)
Stock issued under dividend reinvestment and employee stock purchase plans, shares		25,344
Stock issued under dividend reinvestment and employee stock purchase plans	662		29			633
Vesting of restricted stock unit awards, shares		126,270
Vesting of restricted stock units, net of shares withheld to cover taxes	(1,207)		(3,713)			2,506
Shares under option, exercised		4,167
Exercise of stock options	74		(14)			88
Ending balance, shares at Mar. 31, 2023		29,427,696
Ending balance at Mar. 31, 2023	798,496	$ 157,784	298,167	443,493	(55,550)	(45,398)
Beginning balance, shares at Dec. 31, 2023		29,511,721
Beginning balance at Dec. 31, 2023	839,208	$ 157,784	301,066	474,691	(50,646)	(43,687)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	20,305			20,305
Other comprehensive income, net of income tax	(4,094)				(4,094)
Cash dividends declared	(6,189)			(6,189)
Stock-based compensation	953		970	(17)
Stock issued under dividend reinvestment and employee stock purchase plans, shares		31,906
Stock issued under dividend reinvestment and employee stock purchase plans	648		(5)			653
Vesting of restricted stock unit awards, shares		103,169
Vesting of restricted stock units, net of shares withheld to cover taxes	$ (834)		(3,101)			2,267
Shares under option, exercised	7,788	7,788
Exercise of stock options	$ 150		(16)			166
Purchases of treasury stock, shares		(316,665)
Purchases of treasury stock	(6,478)		0			(6,478)
Ending balance, shares at Mar. 31, 2024		29,337,919
Ending balance at Mar. 31, 2024	$ 843,669	$ 157,784	$ 298,914	$ 488,790	$ (54,740)	$ (47,079)