Consolidated Statements of Shareholders’ Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Loss, Net of Tax	Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2023		72,516,079
Balance at beginning of period at Dec. 31, 2023	$ 3,426,747	$ 72,516	$ 1,945,385	$ 1,539,957	$ (35,939)	$ (95,172)
Balance at beginning of period (in shares) at Dec. 31, 2023						3,462,738
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted shares (in shares)		103,819
Issuance of restricted shares	0	$ 104	(104)
Issuance of common shares pursuant to PSU agreements (in shares)		63,301
Issuance of common shares pursuant to PSU agreements	0	$ 63	(63)
Share-based compensation	3,134		3,134
Purchase of treasury shares (in shares)						105,198
Purchase of treasury shares	(4,998)					$ (4,998)
Net income	74,312			74,312
Dividends on common shares	(10,437)			(10,437)
Other comprehensive income (loss) during the period	(4,020)				(4,020)
Balance at end of period (in shares) at Mar. 31, 2024		72,683,199
Balance at end of period at Mar. 31, 2024	$ 3,484,738	$ 72,683	1,948,352	1,603,832	(39,959)	$ (100,170)
Balance at end of period (in shares) at Mar. 31, 2024						3,567,936
Balance at beginning of period (in shares) at Dec. 31, 2024	72,699,245	72,699,245
Balance at beginning of period at Dec. 31, 2024	$ 3,751,522	$ 72,699	1,958,642	1,853,428	(30,119)	$ (103,128)
Balance at beginning of period (in shares) at Dec. 31, 2024	3,630,636					3,630,636
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted shares (in shares)		76,250
Issuance of restricted shares	$ 0	$ 76	(76)
Forfeitures of restricted shares (in shares)		(13,619)
Forfeitures of restricted shares	(417)	$ (13)	(404)
Issuance of common shares pursuant to PSU agreements (in shares)		122,904
Issuance of common shares pursuant to PSU agreements	0	$ 123	(123)
Share-based compensation	3,693		3,693
Purchase of treasury shares (in shares)						343,220
Purchase of treasury shares	(20,746)					$ (20,746)
Net income	87,935			87,935
Dividends on common shares	(13,874)			(13,874)
Other comprehensive income (loss) during the period	$ 15,689				15,689
Balance at end of period (in shares) at Mar. 31, 2025	72,884,780	72,884,780
Balance at end of period at Mar. 31, 2025	$ 3,823,802	$ 72,885	$ 1,961,732	$ 1,927,489	$ (14,430)	$ (123,874)
Balance at end of period (in shares) at Mar. 31, 2025	3,973,856					3,973,856