CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Retained earnings	Accumulated other comprehensive income (loss)	Treasury Stock, Common
Beginning Balances (in shares) at Dec. 31, 2022		104,281,794			(9,390,695)
Beginning Balances at Dec. 31, 2022	$ 2,041,373	$ 1,634,605	$ 968,237	$ (358,663)	$ (202,806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	136,070		136,070
Other comprehensive income (loss)	5,653			5,653
Cash dividends declared :
Common stock at $0.23 per share in 2024 and $0.23 per share in 2023	(43,592)		(43,592)
Exercise of stock options, net of shares purchased (in shares)					4,855
Exercise of stock options, net of shares purchased	(48)	(57)			$ (105)
Restricted stock awards, net of forfeitures (in shares)					289,529
Restricted stock awards, net of forfeitures	(4,924)	(10,680)			$ 5,756
Share-based compensation expense	8,791	$ 8,791
Ending Balances (in shares) at Jun. 30, 2023		104,281,794			(9,096,311)
Ending Balances at Jun. 30, 2023	2,143,419	$ 1,632,659	1,060,715	(353,010)	$ (196,945)
Beginning Balances (in shares) at Mar. 31, 2023		104,281,794			(9,091,388)
Beginning Balances at Mar. 31, 2023	2,121,496	$ 1,629,428	1,016,893	(328,059)	$ (196,766)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	65,667		65,667
Other comprehensive income (loss)	(24,951)			(24,951)
Cash dividends declared :
Common stock at $0.23 per share in 2024 and $0.23 per share in 2023	(21,845)		(21,845)
Exercise of stock options, net of shares purchased (in shares)					1,387
Exercise of stock options, net of shares purchased	(14)	(16)			$ (30)
Restricted stock awards, net of forfeitures (in shares)					(6,310)
Restricted stock awards, net of forfeitures	(1,137)	(928)			$ (209)
Share-based compensation expense	4,175	$ 4,175
Ending Balances (in shares) at Jun. 30, 2023		104,281,794			(9,096,311)
Ending Balances at Jun. 30, 2023	2,143,419	$ 1,632,659	1,060,715	(353,010)	$ (196,945)
Beginning Balances (in shares) at Dec. 31, 2023		104,281,794			(9,140,550)
Beginning Balances at Dec. 31, 2023	2,267,974	$ 1,638,972	1,136,718	(309,819)	$ (197,897)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	111,494		111,494
Other comprehensive income (loss)	(13,590)			(13,590)
Cash dividends declared :
Common stock at $0.23 per share in 2024 and $0.23 per share in 2023	(43,967)		(43,967)
Restricted stock awards, net of forfeitures (in shares)					344,766
Restricted stock awards, net of forfeitures	(5,015)	(12,211)			$ 7,196
Share-based compensation expense	8,944	$ 8,944
Ending Balances (in shares) at Jun. 30, 2024		104,281,794			(8,795,784)
Ending Balances at Jun. 30, 2024	2,326,439	$ 1,635,705	1,204,844	(323,409)	$ (190,701)
Beginning Balances (in shares) at Mar. 31, 2024		104,281,794			(8,808,199)
Beginning Balances at Mar. 31, 2024	2,287,003	$ 1,632,971	1,166,065	(321,109)	$ (190,924)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	60,805		60,805
Other comprehensive income (loss)	(2,300)			(2,300)
Cash dividends declared :
Common stock at $0.23 per share in 2024 and $0.23 per share in 2023	(22,026)		(22,026)
Restricted stock awards, net of forfeitures (in shares)					12,415
Restricted stock awards, net of forfeitures	(121)	(344)			$ 223
Share-based compensation expense	3,078	$ 3,078
Ending Balances (in shares) at Jun. 30, 2024		104,281,794			(8,795,784)
Ending Balances at Jun. 30, 2024	$ 2,326,439	$ 1,635,705	$ 1,204,844	$ (323,409)	$ (190,701)