Segments (Schedule Of Financial Information By Segment) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net interest income		$ 1,111,858	$ 1,040,246	$ 998,129
Provision for loan losses		(56,138)	(32,903)	(35,451)
Non-interest income		652,281	615,553	573,045
Investment securities gains (losses), net	[1]	3,660	7,823	14,985
Non-interest expense		(979,826)	(951,229)	(930,982)
Income before income taxes		731,835	679,490	619,726
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting Information [Line Items]
Net interest income		(16,063)	(75,479)	(175,893)
Provision for loan losses		(15,467)	6,005	(4,451)
Non-interest income		6,607	9,943	8,712
Investment securities gains (losses), net		3,660	7,823	14,985
Non-interest expense		(45,548)	(59,072)	(54,861)
Income before income taxes		(66,811)	(110,780)	(211,508)
Retail Banking Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net interest income		504,475	511,643	552,215
Provision for loan losses		(38,811)	(37,610)	(27,458)
Non-interest income		98,543	99,896	97,029
Investment securities gains (losses), net		0	0	0
Non-interest expense		(337,732)	(328,328)	(323,582)
Income before income taxes		226,475	245,601	298,204
Commercial Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net interest income		532,786	516,263	522,009
Provision for loan losses		(1,838)	(1,446)	(3,514)
Non-interest income		280,844	262,238	249,063
Investment securities gains (losses), net		0	0	0
Non-interest expense		(430,291)	(405,180)	(395,098)
Income before income taxes		381,501	371,875	372,460
Wealth Segment [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net interest income		90,660	87,819	99,798
Provision for loan losses		(22)	148	(28)
Non-interest income		266,287	243,476	218,241
Investment securities gains (losses), net		0	0	0
Non-interest expense		(166,255)	(158,649)	(157,441)
Income before income taxes		$ 190,670	$ 172,794	$ 160,570

[1] Available for sale debt securities, equity securities, and other securities.