CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)/Income	Treasury Stock	Deferred Compensation Arrangements	Total
Balance at Dec. 31, 2022	$ 54,190	$ 1,050,231	$ 1,152,452	$ (686,439)	$ (26,485)	$ 7,756	$ 1,551,705
Balance (in shares) at Dec. 31, 2022	53,737,249
Increase (Decrease) in Stockholders' Equity
Net income			5,798				5,798
Other comprehensive loss, net of tax				108,354			108,354
Dividends declared:
Common			(23,723)				(23,723)
Common stock activity under employee stock plans	$ 170	343					513
Common stock activity under employee stock plans (in shares)	169,333
Stock-based compensation		2,272					2,272
Distribution of stock under deferred compensation arrangements		(44)			1,126	(1,082)	0
Distribution of stock under deferred compensation arrangements (in shares)	19,264
Treasury stock purchased					(10,966)	60	(10,906)
Treasury stock purchased (in shares)	(200,929)
Balance at Mar. 31, 2023	$ 54,360	1,052,802	1,134,527	(578,085)	(36,325)	6,734	1,634,013
Balance (in shares) at Mar. 31, 2023	53,724,917
Balance at Dec. 31, 2023	$ 54,372	1,060,289	1,188,869	(556,892)	(55,592)	6,891	1,697,937
Balance (in shares) at Dec. 31, 2023	53,327,060
Increase (Decrease) in Stockholders' Equity
Net income			40,872				40,872
Other comprehensive loss, net of tax				(26,924)			(26,924)
Dividends declared:
Common			(23,747)				(23,747)
Common stock activity under employee stock plans	$ 168	788					956
Common stock activity under employee stock plans (in shares)	167,815
Stock-based compensation		2,378					2,378
Distribution of stock under deferred compensation arrangements		53			1,082	(1,135)	0
Distribution of stock under deferred compensation arrangements (in shares)	20,769
Treasury stock purchased					(34,517)		(34,517)
Treasury stock purchased (in shares)	(751,083)
Balance at Mar. 31, 2024	$ 54,540	$ 1,063,508	$ 1,205,994	$ (583,816)	$ (89,027)	$ 5,756	$ 1,656,955
Balance (in shares) at Mar. 31, 2024	52,764,561