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	70,403		70,403
Other comprehensive income (loss)	30,604			30,604
Cash dividends declared :
Common stock at $0.23 per share in 2024 and $0.23 per share in 2023	(21,747)		(21,747)
Exercise of stock options, net of shares purchased (in shares)					3,468
Exercise of stock options, net of shares purchased	(34)	(41)			$ (75)
Restricted stock awards, net of forfeitures (in shares)					295,839
Restricted stock awards, net of forfeitures	(3,787)	(9,752)			$ 5,965
Share-based compensation expense	4,616	$ 4,616
Ending Balances (in shares) at Mar. 31, 2023		104,281,794			(9,091,388)
Ending Balances at Mar. 31, 2023	2,121,496	$ 1,629,428	1,016,893	(328,059)	$ (196,766)
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	50,689		50,689
Other comprehensive income (loss)	(11,290)			(11,290)
Cash dividends declared :
Common stock at $0.23 per share in 2024 and $0.23 per share in 2023	(21,941)		(21,941)
Restricted stock awards, net of forfeitures (in shares)					332,351
Restricted stock awards, net of forfeitures	(4,894)	(11,867)			$ 6,973
Share-based compensation expense	5,866	$ 5,866
Ending Balances (in shares) at Mar. 31, 2024		104,281,794			(8,808,199)
Ending Balances at Mar. 31, 2024	$ 2,287,003	$ 1,632,971	$ 1,166,065	$ (321,109)	$ (190,924)