Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Total
Balance (in shares) at Dec. 31, 2024	70,863,324
Beginning balance, loss, net of tax at Dec. 31, 2024	$ 916	$ 993,962	$ (85,607)	$ 2,688,353	$ (751,920)	$ 2,845,704
Dividend Reinvestment Plan (in shares)	43,009
Dividend Reinvestment Plan	$ 1	1,969	0	0	0	1,970
Restricted stock units vested (in shares)	108,387
Restricted stock units vested	$ 1	0	0	0	0	1
Stock issued to directors (in shares)	22,956
Stock issued to directors	$ 0	1,020	0	0	0	1,020
Shares withheld related to net share settlement of RSUs	$ 0	(2,758)	0	0	0	(2,758)
Purchases of treasury stock (in shares)	(2,751,085)
Purchases of treasury stock	$ 0	0	0	0	(127,923)	(127,923)
Stock-based compensation	0	4,690	0	0	0	4,690
Cash dividends	0	0	0	(70,944)	0	(70,944)
Other comprehensive income (loss)	0	0	25,909	0	0	25,909
Net income	$ 0	0	0	224,607	0	224,607
Balance (in shares) at Sep. 30, 2025	68,286,591
Beginning balance, loss, net of tax at Sep. 30, 2025	$ 918	998,883	(59,698)	2,842,016	(879,843)	2,902,276
Other comprehensive income	$ 0	0	25,909	0	0	25,909
Balance (in shares) at Jun. 30, 2025	69,343,395
Beginning balance, loss, net of tax at Jun. 30, 2025	$ 918	996,249	(69,222)	2,787,608	(829,258)	2,886,295
Dividend Reinvestment Plan (in shares)	12,855
Dividend Reinvestment Plan	$ 0	634	0	0	0	634
Restricted stock units vested (in shares)	341
Restricted stock units vested	$ 0	0	0	0	0	0
Stock issued to directors (in shares)	0
Stock issued to directors	$ 0	0	0	0	0	0
Shares withheld related to net share settlement of RSUs	$ 0	(3)	0	0	0	(3)
Purchases of treasury stock (in shares)	(1,070,000)
Purchases of treasury stock	$ 0	0	0	0	(50,585)	(50,585)
Stock-based compensation	0	2,003	0	0	0	2,003
Cash dividends	0	0	0	(23,243)	0	(23,243)
Other comprehensive income (loss)	0	0	9,524	0	0	9,524
Net income	$ 0	0	0	77,651	0	77,651
Balance (in shares) at Sep. 30, 2025	68,286,591
Beginning balance, loss, net of tax at Sep. 30, 2025	$ 918	998,883	(59,698)	2,842,016	(879,843)	2,902,276
Other comprehensive income	$ 0	0	9,524	0	0	9,524
Balance (in shares) at Dec. 31, 2025	67,200,126
Beginning balance, loss, net of tax at Dec. 31, 2025	$ 918	1,001,401	(54,400)	2,909,677	(932,208)	2,925,388
Dividend Reinvestment Plan (in shares)	35,967
Dividend Reinvestment Plan	$ 1	1,987	0	0	0	1,988
Restricted stock units vested (in shares)	117,681
Restricted stock units vested	$ 1	0	0	0	0	1
Stock issued to directors (in shares)	16,195
Stock issued to directors	$ 0	864	0	0	0	864
Shares withheld related to net share settlement of RSUs	$ 0	(3,878)	0	0	0	(3,878)
Purchases of treasury stock (in shares)	(1,286,241)
Purchases of treasury stock	$ 0	0	0	0	(77,505)	(77,505)
Stock-based compensation	0	5,807	0	0	0	5,807
Cash dividends	0	0	0	(76,093)	0	(76,093)
Other comprehensive income (loss)	0	0	5,904	0	0	5,904
Net income	$ 0	0	0	274,269	0	274,269
Balance (in shares) at Sep. 30, 2026	66,083,728
Beginning balance, loss, net of tax at Sep. 30, 2026	$ 920	1,006,181	(48,496)	3,107,853	(1,009,713)	3,056,745
Other comprehensive income	$ 0	0	5,904	0	0	5,904
Balance (in shares) at Jun. 30, 2026	66,825,367
Beginning balance, loss, net of tax at Jun. 30, 2026	$ 919	1,005,086	(38,314)	3,037,887	(958,964)	3,046,614
Dividend Reinvestment Plan (in shares)	10,379
Dividend Reinvestment Plan	$ 1	646	0	0	0	647
Restricted stock units vested (in shares)	48,576
Restricted stock units vested	$ 0	0	0	0	0	0
Stock issued to directors (in shares)	0
Stock issued to directors	$ 0	1	0	0	0	1
Shares withheld related to net share settlement of RSUs	$ 0	(1,444)	0	0	0	(1,444)
Purchases of treasury stock (in shares)	(800,594)
Purchases of treasury stock	$ 0	0	0	0	(50,749)	(50,749)
Stock-based compensation	0	1,892	0	0	0	1,892
Cash dividends	0	0	0	(25,208)	0	(25,208)
Other comprehensive income (loss)	0	0	(10,182)	0	0	(10,182)
Net income	$ 0	0	0	95,174	0	95,174
Balance (in shares) at Sep. 30, 2026	66,083,728
Beginning balance, loss, net of tax at Sep. 30, 2026	$ 920	1,006,181	(48,496)	3,107,853	(1,009,713)	3,056,745
Other comprehensive income	$ 0	$ 0	$ (10,182)	$ 0	$ 0	$ (10,182)