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	210,070			210,070
Other comprehensive loss	(273,251)				(273,251)
Cash dividends declared	(93,806)			(93,806)
Dividend equivalents declared	0		369	(369)
Share-based compensation expense	14,171		14,171
Issuance of restricted stock, net (in shares)		818,229
Issuance of restricted stock, net	0	$ 4	(4)
Restricted stock surrendered and canceled (in shares)		(234,851)
Restricted stock surrendered and canceled	(8,858)		(8,858)
Exercise of stock options (in shares)		43,846
Exercise of stock options	759		759
Balance at end of period (in shares) at Sep. 30, 2022		95,016,767
Balance at end of period at Sep. 30, 2022	2,735,396	$ 933	2,357,731	657,845	(281,113)
Balance at beginning of period (in shares) at Jun. 30, 2022		94,976,605
Balance at beginning of period at Jun. 30, 2022	2,755,219	$ 933	2,353,361	615,943	(215,018)
Increase (Decrease) in Stockholders' Equity
Net income	73,363			73,363
Other comprehensive loss	(66,095)				(66,095)
Cash dividends declared	(31,337)			(31,337)
Dividend equivalents declared	0		124	(124)
Share-based compensation expense	4,336		4,336
Issuance of restricted stock, net (in shares)		56,452
Issuance of restricted stock, net	0
Restricted stock surrendered and canceled (in shares)		(22,348)
Restricted stock surrendered and canceled	(184)		(184)
Exercise of stock options (in shares)		6,058
Exercise of stock options	94		94
Balance at end of period (in shares) at Sep. 30, 2022		95,016,767
Balance at end of period at Sep. 30, 2022	$ 2,735,396	$ 933	2,357,731	657,845	(281,113)
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	166,228			166,228
Other comprehensive loss	(23,382)				(23,382)
Cash dividends declared	(94,616)			(94,616)
Dividend equivalents declared	0		367	(367)
Share-based compensation expense	14,622		14,622
Issuance of restricted stock, net (in shares)		1,085,234
Issuance of restricted stock, net	0	$ 4	(4)
Restricted stock surrendered and canceled (in shares)		(221,617)
Restricted stock surrendered and canceled	(5,953)		(5,953)
Exercise of stock options (in shares)		15,470
Exercise of stock options	$ 246		246
Balance at end of period (in shares) at Sep. 30, 2023	95,900,847	95,900,847
Balance at end of period at Sep. 30, 2023	$ 2,855,534	$ 937	2,371,941	771,285	(288,629)
Balance at beginning of period (in shares) at Jun. 30, 2023		95,906,217
Balance at beginning of period at Jun. 30, 2023	2,849,134	$ 937	2,366,639	757,025	(275,467)
Increase (Decrease) in Stockholders' Equity
Net income	46,030			46,030
Other comprehensive loss	(13,162)				(13,162)
Cash dividends declared	(31,647)			(31,647)
Dividend equivalents declared	0		123	(123)
Share-based compensation expense	5,350		5,350
Issuance of restricted stock, net (in shares)		11,161
Issuance of restricted stock, net	0
Restricted stock surrendered and canceled (in shares)		(16,531)
Restricted stock surrendered and canceled	(171)		(171)
Exercise of stock options	$ 0
Balance at end of period (in shares) at Sep. 30, 2023	95,900,847	95,900,847
Balance at end of period at Sep. 30, 2023	$ 2,855,534	$ 937	$ 2,371,941	$ 771,285	$ (288,629)