CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss, net of tax [Member]
Balance at beginning of period at Dec. 31, 2022			$ 970,722	$ 1,644,209		$ (506,979)	$ (804,778)
Balance at beginning of period (ASU 2022-02) at Dec. 31, 2022					$ (1,357)
Stock-based compensation expense			5,898
Common stock repurchases (See Note 13)						(128,228)
Common stock reissued under stock-based compensation plan			(13,490)			13,490
Restricted stock forfeited			661			(661)
Net income	$ 223,375			223,375
Dividends on common stock ($0.16 per share and $0.14 per share for the quarters ended September 30, 2024 and 2023, respectively; $0.48 per share and $0.42 per share for the nine-month periods ended September 30, 2024 and 2023, respectively))				(75,575)
Other comprehensive income (loss), net of tax	(46,585)						(46,585)
Balance at end of period at Sep. 30, 2023	1,303,068	$ 22,366	963,791	1,790,652		(622,378)	(851,363)
Balance at beginning of period at Jun. 30, 2023			962,229	1,733,497		(547,706)	(772,387)
Balance at beginning of period (ASU 2022-02) at Jun. 30, 2023					0
Stock-based compensation expense			1,901
Common stock repurchases (See Note 13)						(75,011)
Common stock reissued under stock-based compensation plan			(351)			351
Restricted stock forfeited			12			(12)
Net income	82,022			82,022
Dividends on common stock ($0.16 per share and $0.14 per share for the quarters ended September 30, 2024 and 2023, respectively; $0.48 per share and $0.42 per share for the nine-month periods ended September 30, 2024 and 2023, respectively))				(24,867)
Other comprehensive income (loss), net of tax	(78,976)						(78,976)
Balance at end of period at Sep. 30, 2023	1,303,068	22,366	963,791	1,790,652		(622,378)	(851,363)
Balance at beginning of period at Dec. 31, 2023	1,497,609		965,707	1,846,112		(697,406)	(639,170)
Balance at beginning of period (ASU 2022-02) at Dec. 31, 2023					0
Stock-based compensation expense			6,789
Common stock repurchases (See Note 13)						(102,369)
Common stock reissued under stock-based compensation plan			(9,621)			9,621
Restricted stock forfeited			98			(98)
Net income	223,023			223,023
Dividends on common stock ($0.16 per share and $0.14 per share for the quarters ended September 30, 2024 and 2023, respectively; $0.48 per share and $0.42 per share for the nine-month periods ended September 30, 2024 and 2023, respectively))				(79,716)
Other comprehensive income (loss), net of tax	155,549						155,549
Balance at end of period at Sep. 30, 2024	1,700,885	22,366	962,973	1,989,419		(790,252)	(483,621)
Balance at beginning of period at Jun. 30, 2024			961,254	1,941,980		(790,465)	(643,675)
Balance at beginning of period (ASU 2022-02) at Jun. 30, 2024					$ 0
Stock-based compensation expense			1,942
Common stock repurchases (See Note 13)						(10)
Common stock reissued under stock-based compensation plan			(274)			274
Restricted stock forfeited			51			(51)
Net income	73,727			73,727
Dividends on common stock ($0.16 per share and $0.14 per share for the quarters ended September 30, 2024 and 2023, respectively; $0.48 per share and $0.42 per share for the nine-month periods ended September 30, 2024 and 2023, respectively))				(26,288)
Other comprehensive income (loss), net of tax	160,054						160,054
Balance at end of period at Sep. 30, 2024	$ 1,700,885	$ 22,366	$ 962,973	$ 1,989,419		$ (790,252)	$ (483,621)