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	98,203		98,203
Other comprehensive income (loss)	(17,929)			(17,929)
Cash dividends declared :
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020	(44,775)		(44,775)
Treasury Stock, Shares, Acquired					(2,149,060)
Treasury Stock, Value, Acquired, Cost Method	(50,846)				$ (50,846)
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)					323,172
Restricted stock awards, net of forfeitures	(2,585)	(8,776)			$ 6,191
Share-based compensation expense	5,335	$ 5,335
Ending Balances (in shares) at Jun. 30, 2021		104,281,794			(8,082,285)
Ending Balances at Jun. 30, 2021	2,269,507	$ 1,635,470	773,857	30,735	$ (170,555)
Beginning Balances (in shares) at Mar. 31, 2021		104,281,794			(6,764,101)
Beginning Balances at Mar. 31, 2021	2,258,942	$ 1,633,137	745,220	18,101	$ (137,516)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	50,888		50,888
Other comprehensive income (loss)	12,634			12,634
Cash dividends declared :
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020	(22,251)		(22,251)
Restricted stock awards, net of forfeitures (in shares)					(9,239)
Restricted stock awards, net of forfeitures	(335)	(160)			$ (175)
Share-based compensation expense	2,493	$ 2,493
Ending Balances (in shares) at Jun. 30, 2021		104,281,794			(8,082,285)
Ending Balances at Jun. 30, 2021	2,269,507	$ 1,635,470	773,857	30,735	$ (170,555)
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	92,821		92,821
Other comprehensive income (loss)	(242,895)			(242,895)
Cash dividends declared :
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020	(43,288)		(43,288)
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)					283,892
Restricted stock awards, net of forfeitures	(2,915)	(8,789)			$ 5,874
Share-based compensation expense	5,828	$ 5,828
Ending Balances (in shares) at Jun. 30, 2022		104,281,794			(9,833,002)
Ending Balances at Jun. 30, 2022	2,068,670	$ 1,637,237	887,006	(243,328)	$ (212,245)
Beginning Balances (in shares) at Mar. 31, 2022		104,281,794			(9,830,298)
Beginning Balances at Mar. 31, 2022	2,137,445	$ 1,634,903	857,178	(142,477)	$ (212,159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	51,520		51,520
Other comprehensive income (loss)	(100,851)			(100,851)
Cash dividends declared :
Common stock at $0.23 per share in 2021 and $0.23 per share in 2020	(21,692)		(21,692)
Restricted stock awards, net of forfeitures (in shares)					(2,704)
Restricted stock awards, net of forfeitures	(73)	13			$ (86)
Share-based compensation expense	2,321	$ 2,321
Ending Balances (in shares) at Jun. 30, 2022		104,281,794			(9,833,002)
Ending Balances at Jun. 30, 2022	2,068,670	$ 1,637,237	$ 887,006	$ (243,328)	$ (212,245)
Retained Earnings (Accumulated Deficit)	$ 887,006