Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Beginning balance at Dec. 31, 2022	$ 410,058	$ 205	$ 484,989	$ 140,095	$ (113,511)	$ (101,720)
Beginning balance, shares at Dec. 31, 2022		15,930,112
Net income	23,779			23,779
Other comprehensive income (loss), net of tax effects	3,286				3,286
Cash dividends - common stock per share	(3,114)			(3,114)
Dividend equivalents - restricted stock units and restricted stock awards, per share	(45)			(45)
Stock-based compensation	1,780		1,780
Common stock issued under stock-based incentive plan		$ 2	(2)
Common stock issued under stock-based incentive plan, shares		133,685
Common stock issued under employee stock purchase plan	458		458
Common stock issued under employee stock purchase plan, share		17,508
Treasury stock purchases	(17,767)					(17,767)
Treasury stock purchases, shares		(669,166)
Ending balance at Jun. 30, 2023	418,435	$ 207	487,225	160,715	(110,225)	(119,487)
Ending balance, shares at Jun. 30, 2023		15,412,139
Beginning balance at Dec. 31, 2022	410,058	$ 205	484,989	140,095	(113,511)	(101,720)
Beginning balance, shares at Dec. 31, 2022		15,930,112
Ending balance at Dec. 31, 2023	452,860	$ 207	489,187	141,006	(57,920)	(119,620)
Ending balance, shares at Dec. 31, 2023		15,443,651
Beginning balance at Mar. 31, 2023	425,123	$ 206	486,658	150,810	(101,238)	(111,313)
Beginning balance, shares at Mar. 31, 2023		15,730,257
Net income	11,456			11,456
Other comprehensive income (loss), net of tax effects	(8,987)				(8,987)
Cash dividends - common stock per share	(1,541)			(1,541)
Dividend equivalents - restricted stock units and restricted stock awards, per share	(10)			(10)
Stock-based compensation	568		568
Common stock issued under stock-based incentive plan		$ 1	(1)
Common stock issued under stock-based incentive plan, shares		30,998
Treasury stock purchases	(8,174)					(8,174)
Treasury stock purchases, shares		(349,116)
Ending balance at Jun. 30, 2023	418,435	$ 207	487,225	160,715	(110,225)	(119,487)
Ending balance, shares at Jun. 30, 2023		15,412,139
Beginning balance at Dec. 31, 2023	452,860	$ 207	489,187	141,006	(57,920)	(119,620)
Beginning balance, shares at Dec. 31, 2023		15,443,651
Net income	25,784			25,784
Other comprehensive income (loss), net of tax effects	(4,085)				(4,085)
Cash dividends - common stock per share	(3,666)			(3,666)
Dividend equivalents - restricted stock units and restricted stock awards, per share	(56)			(56)
Stock-based compensation	1,863		1,863
Common stock issued upon exercise of stock options	292		292
Common stock issued upon exercise of stock options, shares		10,250
Common stock issued under stock-based incentive plan		$ 1	(1)
Common stock issued under stock-based incentive plan, shares		99,750
Common stock issued under employee stock purchase plan	368		368
Common stock issued under employee stock purchase plan, share		16,884
Treasury stock purchases	(11,925)					(11,925)
Treasury stock purchases, shares		(362,573)
Ending balance at Jun. 30, 2024	461,435	$ 208	491,709	163,068	(62,005)	(131,545)
Ending balance, shares at Jun. 30, 2024		15,207,962
Beginning balance at Mar. 31, 2024	456,776	$ 208	490,533	153,201	(60,788)	(126,378)
Beginning balance, shares at Mar. 31, 2024		15,343,199
Net income	11,716			11,716
Other comprehensive income (loss), net of tax effects	(1,217)				(1,217)
Cash dividends - common stock per share	(1,823)			(1,823)
Dividend equivalents - restricted stock units and restricted stock awards, per share	(26)			(26)
Stock-based compensation	913		913
Common stock issued upon exercise of stock options	263		263
Common stock issued upon exercise of stock options, shares		9,000
Common stock issued under stock-based incentive plan, shares		8,745
Treasury stock purchases	(5,167)					(5,167)
Treasury stock purchases, shares		(152,982)
Ending balance at Jun. 30, 2024	$ 461,435	$ 208	$ 491,709	$ 163,068	$ (62,005)	$ (131,545)
Ending balance, shares at Jun. 30, 2024		15,207,962