Segments (Schedule Of Financial Information By Segment) (Details)		3 Months Ended
		Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Segment Reporting Information, Intersegment Revenue		$ 0	$ 0
Number of operating segments		3	3
Net interest income		$ 163,775,000	$ 146,138,000
Provision for loan losses		(9,439,000)	(4,420,000)
Non-interest income		119,024,000	106,574,000
Investment securities gains (losses), net	[1]	(995,000)	6,035,000
Non-interest expense		(177,473,000)	(163,845,000)
Income before income taxes		94,892,000	90,482,000
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		66,570,000	65,664,000
Provision for loan losses		(8,725,000)	(8,323,000)
Non-interest income		29,896,000	26,612,000
Investment securities gains (losses), net		0	0
Non-interest expense		(68,976,000)	(66,692,000)
Income before income taxes		18,765,000	17,261,000
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		75,911,000	71,111,000
Provision for loan losses		19,000	877,000
Non-interest income		51,119,000	47,581,000
Investment securities gains (losses), net		0	0
Non-interest expense		(69,757,000)	(64,770,000)
Income before income taxes		57,292,000	54,799,000
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income		10,875,000	10,742,000
Provision for loan losses		(106,000)	7,000
Non-interest income		34,402,000	33,659,000
Investment securities gains (losses), net		0	0
Non-interest expense		(28,540,000)	(27,270,000)
Income before income taxes		16,631,000	17,138,000
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income		153,356,000	147,517,000
Provision for loan losses		(8,812,000)	(7,439,000)
Non-interest income		115,417,000	107,852,000
Investment securities gains (losses), net		0	0
Non-interest expense		(167,273,000)	(158,732,000)
Income before income taxes		92,688,000	89,198,000
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income		10,419,000	(1,379,000)
Provision for loan losses		(627,000)	3,019,000
Non-interest income		3,607,000	(1,278,000)
Investment securities gains (losses), net		(995,000)	6,035,000
Non-interest expense		(10,200,000)	(5,113,000)
Income before income taxes		$ 2,204,000	$ 1,284,000

[1] Available for sale and non-marketable securities