CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period (in shares) at Dec. 31, 2020		94,483,136
Balance at beginning of period at Dec. 31, 2020	$ 2,746,649	$ 931	$ 2,354,871	$ 330,555	$ 60,292
Increase (Decrease) in Stockholders' Equity
Net income	164,970			164,970
Other comprehensive (loss) income	(33,768)				(33,768)
Repurchase and retirement of common stock (in shares)		(199,674)
Repurchase and retirement of common stock	(6,897)	$ (2)	(4,977)	(1,918)
Cash dividends declared	(59,521)			(59,521)
Dividend equivalents declared	0		234	(234)
Share-based compensation expense	6,562		6,562
Issuance of restricted stock, net (in shares)		435,957
Issuance of restricted stock, net	0	$ 2	(2)
Restricted stock surrendered and canceled (in shares)		(110,027)
Restricted stock surrendered and canceled	(5,308)		(5,308)
Exercise of stock options (in shares)		47,183
Exercise of stock options	732		732
Balance at end of period (in shares) at Jun. 30, 2021		94,656,575
Balance at end of period at Jun. 30, 2021	2,813,419	$ 931	2,352,112	433,852	26,524
Balance at beginning of period (in shares) at Mar. 31, 2021		94,644,415
Balance at beginning of period at Mar. 31, 2021	2,703,098	$ 931	2,348,445	368,911	(15,189)
Increase (Decrease) in Stockholders' Equity
Net income	96,302			96,302
Other comprehensive (loss) income	41,713				41,713
Cash dividends declared	(31,234)			(31,234)
Dividend equivalents declared	0		127	(127)
Share-based compensation expense	3,457		3,457
Issuance of restricted stock, net (in shares)		16,200
Issuance of restricted stock, net	0
Restricted stock surrendered and canceled (in shares)		(9,477)
Restricted stock surrendered and canceled	(29)		(29)
Exercise of stock options (in shares)		5,437
Exercise of stock options	112		112
Balance at end of period (in shares) at Jun. 30, 2021		94,656,575
Balance at end of period at Jun. 30, 2021	$ 2,813,419	$ 931	2,352,112	433,852	26,524
Balance at beginning of period (in shares) at Dec. 31, 2021	94,389,543	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	66,904
Balance at end of period (in shares) at Mar. 31, 2022		94,945,849
Balance at end of period at Mar. 31, 2022	$ 2,783,018	$ 933	2,348,727	577,591	(144,233)
Balance at beginning of period (in shares) at Dec. 31, 2021	94,389,543	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) income	(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	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) income	(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		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	94,976,605
Balance at end of period at Jun. 30, 2022	$ 2,755,219	$ 933	$ 2,353,361	$ 615,943	$ (215,018)