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	150,922				150,922
Other comprehensive income (loss)	122,793					122,793
Stock option exercises/stock unit conversions (28,958 shares YTD in 2026 and 103,936 shares YTD in 2025)	3,708				(7,650)		11,358
Stock compensation expense recognized in earnings	4,081			4,081
Purchase of treasury stock (519,098 shares YTD in 2026 and 18,427 shares YTD in 2025)	(2,600)						(2,600)
Cash dividends – preferred stock (approximately $11.13 per share which is equivalent to approximately $0.28 per depository share YTD in both 2026 and 2025, respectively.)	(1,669)				(1,669)
Cash dividends – common stock ($1.00 per share YTD in 2026 and $0.95 per share YTD in 2025)	(61,663)				(61,663)
Total shareholders’ equity at end of period at Mar. 31, 2025	4,114,160	145,452	644	1,079,653	4,031,422	(1,129,211)	(13,800)
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	170,987				170,987
Other comprehensive income (loss)	(80,560)					(80,560)
Conversion of Stock, Amount Issued	0				(3,618)		3,618
Stock compensation expense recognized in earnings	5,181			5,181
Purchase of treasury stock (519,098 shares YTD in 2026 and 18,427 shares YTD in 2025)	(72,298)						(72,298)
Cash dividends – preferred stock (approximately $11.13 per share which is equivalent to approximately $0.28 per depository share YTD in both 2026 and 2025, respectively.)	(1,669)				(1,669)
Cash dividends – common stock ($1.00 per share YTD in 2026 and $0.95 per share YTD in 2025)	(64,008)				(64,008)
Total shareholders’ equity at end of period at Mar. 31, 2026	$ 4,530,669	$ 145,452	$ 644	$ 1,105,508	$ 4,410,863	$ (923,511)	$ (208,287)