CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock
Beginning Balances (in shares) at Dec. 31, 2020		104,281,794			(6,259,865)
Beginning Balances at Dec. 31, 2020	$ 2,282,070	$ 1,638,947	$ 720,429	$ 48,664	$ (125,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	47,315		47,315
Other comprehensive income (loss)	(30,563)			(30,563)
Cash dividends declared :
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020	(22,524)		(22,524)
Treasury Stock, Shares, Acquired					(840,115)
Treasury Stock, Value, Acquired, Cost Method	(17,982)				$ (17,982)
Exercise of stock options, net of shares purchased (in shares)					3,468
Exercise of stock options, net of shares purchased	(34)	(36)			$ (70)
Restricted stock awards, net of forfeitures (in shares)					332,411
Restricted stock awards, net of forfeitures	(2,250)	(8,616)			$ 6,366
Share-based compensation expense	2,842	$ 2,842
Ending Balances (in shares) at Mar. 31, 2021		104,281,794			(6,764,101)
Ending Balances at Mar. 31, 2021	2,258,942	$ 1,633,137	745,220	18,101	$ (137,516)
Retained Earnings (Accumulated Deficit)	837,473
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 2021 and $0.23 per share in 2020	(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)	$ 857,178