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, 2021		104,281,794			(10,132,554)
Beginning Balances at Dec. 31, 2021	$ 2,258,942	$ 1,640,358	$ 837,473	$ (433)	$ (218,456)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	41,301		41,301
Other comprehensive income (loss)	(142,044)			(142,044)
Cash dividends declared :
Common stock at $0.23 per share in 2023 and $0.23 per share in 2022	(21,596)		(21,596)
Exercise of stock options, net of shares purchased (in shares)					15,660
Exercise of stock options, net of shares purchased	(177)	(160)			$ (337)
Restricted stock awards, net of forfeitures (in shares)					286,596
Restricted stock awards, net of forfeitures	(2,842)	(8,802)			$ 5,960
Share-based compensation expense	3,507	$ 3,507
Ending Balances (in shares) at Mar. 31, 2022		104,281,794			(9,830,298)
Ending Balances at Mar. 31, 2022	2,137,445	$ 1,634,903	857,178	(142,477)	$ (212,159)
Retained Earnings (Accumulated Deficit)	968,237
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 2023 and $0.23 per share in 2022	(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)
Retained Earnings (Accumulated Deficit)	$ 1,016,893