Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common
Total shareholders’ equity at beginning of period at Dec. 31, 2024	$ 3,898,588	$ 145,452	$ 644	$ 1,075,572	$ 3,951,482	$ (1,252,004)	$ (22,558)
Net income	482,305				482,305
Other comprehensive income (loss)	327,584					327,584
Stock option exercises/stock unit conversions	7,881				(11,405)		19,286
Stock compensation expense recognized in earnings	13,183			13,183
Purchase of treasury stock	(72,461)						(72,461)
Cash dividends – preferred stock	(5,006)				(5,006)
Cash dividends – common stock	(191,292)				(191,292)
Total shareholders’ equity at end of period at Sep. 30, 2025	4,460,782	145,452	644	1,088,755	4,226,084	(924,420)	(75,733)
Total shareholders’ equity at beginning of period at Jun. 30, 2025	4,200,310	145,452	644	1,084,485	4,119,886	(1,140,472)	(9,685)
Net income	174,380				174,380
Other comprehensive income (loss)	216,052					216,052
Stock option exercises/stock unit conversions	1,925				(1,812)		3,737
Stock compensation expense recognized in earnings	4,270			4,270
Purchase of treasury stock	(69,785)						(69,785)
Cash dividends – preferred stock	(1,668)				(1,668)
Cash dividends – common stock	(64,702)				(64,702)
Total shareholders’ equity at end of period at Sep. 30, 2025	4,460,782	145,452	644	1,088,755	4,226,084	(924,420)	(75,733)
Total shareholders’ equity at beginning of period at Dec. 31, 2025	4,573,036	145,452	644	1,100,327	4,309,171	(842,951)	(139,607)
Net income	523,255				523,255
Other comprehensive income (loss)	(761,242)					(761,242)
Conversion of Stock, Amount Issued	0				(4,489)		4,489
Stock compensation expense recognized in earnings	16,206			16,206
Purchase of treasury stock	(178,349)						(178,349)
Cash dividends – preferred stock	(5,006)				(5,006)
Cash dividends – common stock	(193,739)				(193,739)
Total shareholders’ equity at end of period at Sep. 30, 2026	3,974,161	145,452	644	1,116,533	4,629,192	(1,604,193)	(313,467)
Total shareholders’ equity at beginning of period at Jun. 30, 2026	4,622,643	145,452	644	1,110,911	4,515,631	(851,660)	(298,335)
Net income	180,209				180,209
Other comprehensive income (loss)	(752,533)					(752,533)
Conversion of Stock, Amount Issued	0				(24)		24
Stock compensation expense recognized in earnings	5,622			5,622
Purchase of treasury stock	(15,156)						(15,156)
Cash dividends – preferred stock	(1,668)				(1,668)
Cash dividends – common stock	(64,956)				(64,956)
Total shareholders’ equity at end of period at Sep. 30, 2026	$ 3,974,161	$ 145,452	$ 644	$ 1,116,533	$ 4,629,192	$ (1,604,193)	$ (313,467)