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, 2022	$ 3,137,228	$ 145,452	$ 643	$ 1,029,756	$ 3,309,671	$ (1,348,294)	$ 0
Net income	177,653				177,653
Other comprehensive income (loss)	206,156					206,156
Stock option exercises/stock unit conversions (84,176 shares YTD in 2024 and 50,387 shares YTD in 2023)	1,500		1	1,463	(28)		64
Stock compensation expense recognized in earnings	4,742			4,742
Purchase of treasury stock (18,193 shares YTD in 2024 and 9,183 shares YTD in 2023)	(1,173)						(1,173)
Cash dividends – preferred stock (approximately $11.13 per share which is equivalent to approximately $0.28 per depository share YTD in 2024 and 2023, respectively.)	(1,669)				(1,669)
Cash dividends – common stock ($0.92 per share YTD in 2024 and $0.87 per share YTD in 2023)	(56,636)				(56,636)
Total shareholders’ equity at end of period at Mar. 31, 2023	3,467,801	145,452	644	1,035,961	3,428,991	(1,142,138)	(1,109)
Total shareholders’ equity at beginning of period at Dec. 31, 2023	3,716,447	145,452	644	1,055,809	3,657,688	(1,119,219)	(23,927)
Net income	135,690				135,690
Other comprehensive income (loss)	(157,064)					(157,064)
Stock option exercises/stock unit conversions (84,176 shares YTD in 2024 and 50,387 shares YTD in 2023)	2,915				(5,346)		8,261
Stock compensation expense recognized in earnings	3,738			3,738
Purchase of treasury stock (18,193 shares YTD in 2024 and 9,183 shares YTD in 2023)	(2,073)						(2,073)
Cash dividends – preferred stock (approximately $11.13 per share which is equivalent to approximately $0.28 per depository share YTD in 2024 and 2023, respectively.)	(1,669)				(1,669)
Cash dividends – common stock ($0.92 per share YTD in 2024 and $0.87 per share YTD in 2023)	(59,804)				(59,804)
Total shareholders’ equity at end of period at Mar. 31, 2024	$ 3,638,180	$ 145,452	$ 644	$ 1,059,547	$ 3,726,559	$ (1,276,283)	$ (17,739)