Consolidated Statements of Shareholders’ Equity (unaudited) - USD ($) $ in Thousands	Total	Cumulative effect of change in accounting principle for ASU 2022-02	Common Stock	Capital Surplus	Retained Earnings	Retained Earnings Cumulative effect of change in accounting principle for ASU 2022-02	Accumulated Other Comprehensive Loss, Net of Tax	Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting principle for ASU 2022-02		$ 1,277				$ 1,277
Balance at beginning of period (in shares) at Dec. 31, 2022			72,263,727
Balance at beginning of period at Dec. 31, 2022	$ 3,197,400		$ 72,264	$ 1,935,211	$ 1,311,258		$ (46,507)	$ (74,826)
Balance at beginning of period (in shares) at Dec. 31, 2022								2,894,677
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares pursuant to PSU agreements (in shares)			102,973
Issuance of common shares pursuant to PSU agreements	0		$ 103	(103)
Issuance of restricted shares (in shares)			101,510
Issuance of restricted shares	0		$ 101	(101)
Proceeds from exercise of stock options (in shares)			16,000
Proceeds from exercise of stock options	476		$ 16	460
Share-based compensation	2,197			2,197
Purchase of treasury shares (in shares)								215,670
Purchase of treasury shares	(9,058)							$ (9,058)
Net income	60,421				60,421
Dividends on common shares	(10,444)				(10,444)
Other comprehensive loss during the period	10,926						10,926
Balance at end of period (in shares) at Mar. 31, 2023			72,484,210
Balance at end of period at Mar. 31, 2023	$ 3,253,195		$ 72,484	1,937,664	1,362,512		(35,581)	$ (83,884)
Balance at end of period (in shares) at Mar. 31, 2023								3,110,347
Balance at beginning of period (in shares) at Dec. 31, 2023	72,516,079		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							3,462,738
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common shares pursuant to PSU agreements (in shares)			63,301
Issuance of common shares pursuant to PSU agreements	$ 0		$ 63	(63)
Issuance of restricted shares (in shares)			103,819
Issuance of restricted shares	0		$ 104	(104)
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 loss during the period	$ (4,020)						(4,020)
Balance at end of period (in shares) at Mar. 31, 2024	72,683,199		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							3,567,936