CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Retained Earnings	Accumulated Other Comprehensive Loss
Balance at beginning of period (in shares) at Dec. 31, 2021		94,389,543
Balance at beginning of period at Dec. 31, 2021	$ 2,886,311	$ 929	$ 2,351,294	$ 541,950	$ (7,862)
Increase (Decrease) in Stockholders' Equity
Net income	136,707			136,707
Other comprehensive loss	(207,156)				(207,156)
Cash dividends declared	(62,469)			(62,469)
Dividend equivalents declared	0		245	(245)
Share-based compensation expense	9,835		9,835
Issuance of restricted stock, net (in shares)		761,777
Issuance of restricted stock, net	0	$ 4	(4)
Restricted stock surrendered and canceled (in shares)		(212,503)
Restricted stock surrendered and canceled	(8,674)		(8,674)
Exercise of stock options (in shares)		37,788
Exercise of stock options	665		665
Balance at end of period (in shares) at Jun. 30, 2022		94,976,605
Balance at end of period at Jun. 30, 2022	2,755,219	$ 933	2,353,361	615,943	(215,018)
Balance at beginning of period (in shares) at Mar. 31, 2022		94,945,849
Balance at beginning of period at Mar. 31, 2022	2,783,018	$ 933	2,348,727	577,591	(144,233)
Increase (Decrease) in Stockholders' Equity
Net income	69,803			69,803
Other comprehensive loss	(70,785)				(70,785)
Cash dividends declared	(31,327)			(31,327)
Dividend equivalents declared	0		124	(124)
Share-based compensation expense	4,305		4,305
Issuance of restricted stock, net (in shares)		46,994
Issuance of restricted stock, net	0
Restricted stock surrendered and canceled (in shares)		(37,284)
Restricted stock surrendered and canceled	(126)		(126)
Exercise of stock options (in shares)		21,046
Exercise of stock options	331		331
Balance at end of period (in shares) at Jun. 30, 2022		94,976,605
Balance at end of period at Jun. 30, 2022	$ 2,755,219	$ 933	2,353,361	615,943	(215,018)
Balance at beginning of period (in shares) at Dec. 31, 2022	95,021,760	95,021,760
Balance at beginning of period at Dec. 31, 2022	$ 2,798,389	$ 933	2,362,663	700,040	(265,247)
Increase (Decrease) in Stockholders' Equity
Net income	120,198			120,198
Other comprehensive loss	(10,220)				(10,220)
Cash dividends declared	(62,969)			(62,969)
Dividend equivalents declared	0		244	(244)
Share-based compensation expense	9,272		9,272
Issuance of restricted stock, net (in shares)		1,074,073
Issuance of restricted stock, net	0	$ 4	(4)
Restricted stock surrendered and canceled (in shares)		(205,086)
Restricted stock surrendered and canceled	(5,782)		(5,782)
Exercise of stock options (in shares)		15,470
Exercise of stock options	$ 246		246
Balance at end of period (in shares) at Jun. 30, 2023	95,906,217	95,906,217
Balance at end of period at Jun. 30, 2023	$ 2,849,134	$ 937	2,366,639	757,025	(275,467)
Balance at beginning of period (in shares) at Mar. 31, 2023		95,714,777
Balance at beginning of period at Mar. 31, 2023	2,831,161	$ 937	2,361,830	731,123	(262,729)
Increase (Decrease) in Stockholders' Equity
Net income	57,636			57,636
Other comprehensive loss	(12,738)				(12,738)
Cash dividends declared	(31,612)			(31,612)
Dividend equivalents declared	0		122	(122)
Share-based compensation expense	4,543		4,543
Issuance of restricted stock, net (in shares)		239,349
Issuance of restricted stock, net	0
Restricted stock surrendered and canceled (in shares)		(62,911)
Restricted stock surrendered and canceled	(91)		(91)
Exercise of stock options (in shares)		15,002
Exercise of stock options	$ 235		235
Balance at end of period (in shares) at Jun. 30, 2023	95,906,217	95,906,217
Balance at end of period at Jun. 30, 2023	$ 2,849,134	$ 937	$ 2,366,639	$ 757,025	$ (275,467)