Consolidated Statements of Shareholders’ Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Income (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)		128,391
Issuance of restricted shares	0	$ 129	(129)
Issuance of common shares pursuant to PSU agreements (in shares)		63,301
Issuance of common shares pursuant to PSU agreements	0	$ 63	(63)
Forfeitures of restricted shares (in shares)		(10,116)
Forfeitures of restricted shares	(224)	$ (10)	(214)
Share-based compensation	9,553		9,553
Purchase of treasury shares (in shares)						167,898
Purchase of treasury shares	(7,955)					$ (7,955)
Net income	264,309			264,309
Dividends on common shares	(31,277)			(31,277)
Other comprehensive income during the period	20,215				20,215
Balance at end of period (in shares) at Sep. 30, 2024		72,697,655
Balance at end of period at Sep. 30, 2024	3,681,368	$ 72,698	1,954,532	1,772,989	(15,724)	$ (103,127)
Balance at end of period (in shares) at Sep. 30, 2024						3,630,636
Balance at beginning of period (in shares) at Jun. 30, 2024		72,697,209
Balance at beginning of period at Jun. 30, 2024	3,566,614	$ 72,697	1,950,846	1,684,218	(38,020)	$ (103,127)
Balance at beginning of period (in shares) at Jun. 30, 2024						3,630,636
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted shares (in shares)		2,559
Issuance of restricted shares	0	$ 3	(3)
Forfeitures of restricted shares (in shares)		(2,113)
Forfeitures of restricted shares	(43)	$ (2)	(41)
Share-based compensation	3,730		3,730
Net income	99,212			99,212
Dividends on common shares	(10,441)			(10,441)
Other comprehensive income during the period	22,296				22,296
Balance at end of period (in shares) at Sep. 30, 2024		72,697,655
Balance at end of period at Sep. 30, 2024	$ 3,681,368	$ 72,698	1,954,532	1,772,989	(15,724)	$ (103,127)
Balance at end of period (in shares) at Sep. 30, 2024						3,630,636
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)		91,440
Issuance of restricted shares	$ 0	$ 91	(91)
Issuance of common shares pursuant to PSU agreements (in shares)		122,904
Issuance of common shares pursuant to PSU agreements	0	$ 123	(123)
Forfeitures of restricted shares (in shares)		(13,619)
Forfeitures of restricted shares	(417)	$ (13)	(404)
Share-based compensation	10,100		10,100
Purchase of treasury shares (in shares)						681,592
Purchase of treasury shares	(42,078)					$ (42,078)
Net income	303,798			303,798
Dividends on common shares	(41,514)			(41,514)
Other comprehensive income during the period	$ 35,290				35,290
Balance at end of period (in shares) at Sep. 30, 2025	72,899,970	72,899,970
Balance at end of period at Sep. 30, 2025	$ 4,016,701	$ 72,900	1,968,124	2,115,712	5,171	$ (145,206)
Balance at end of period (in shares) at Sep. 30, 2025	4,312,228					4,312,228
Balance at beginning of period (in shares) at Jun. 30, 2025		72,897,371
Balance at beginning of period at Jun. 30, 2025	$ 3,917,678	$ 72,897	1,964,896	2,023,493	(6,886)	$ (136,722)
Balance at beginning of period (in shares) at Jun. 30, 2025						4,186,328
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of restricted shares (in shares)		2,599
Issuance of restricted shares	0	$ 3	(3)
Share-based compensation	3,231		3,231
Purchase of treasury shares (in shares)						125,900
Purchase of treasury shares	(8,484)					$ (8,484)
Net income	106,029			106,029
Dividends on common shares	(13,810)			(13,810)
Other comprehensive income during the period	$ 12,057				12,057
Balance at end of period (in shares) at Sep. 30, 2025	72,899,970	72,899,970
Balance at end of period at Sep. 30, 2025	$ 4,016,701	$ 72,900	$ 1,968,124	$ 2,115,712	$ 5,171	$ (145,206)
Balance at end of period (in shares) at Sep. 30, 2025	4,312,228					4,312,228