Segments (Schedule Of Financial Information By Segment) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Segment Reporting Information, Intersegment Revenue			$ 0	$ 0
Number of operating segments			3	3
Net interest income	160,493,000	159,458,000	313,559,000	309,801,000
Provision for loan losses	(7,555,000)	(7,379,000)	(17,215,000)	(10,664,000)
Non-interest income	108,763,000	102,676,000	211,390,000	202,553,000
Investment securities gains (losses), net	(2,558,000)	(1,568,000)	7,479,000	(3,733,000)
Non-interest expense	(162,931,000)	(156,966,000)	(325,271,000)	(312,003,000)
Income before income taxes	96,212,000	96,221,000	189,942,000	185,954,000
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	67,732,000	66,902,000	134,594,000	134,115,000
Provision for loan losses	(8,323,000)	(8,670,000)	(17,543,000)	(16,881,000)
Non-interest income	28,711,000	28,276,000	54,355,000	54,884,000
Investment securities gains (losses), net	0	0	0	0
Non-interest expense	(67,503,000)	(68,961,000)	(133,790,000)	(136,865,000)
Income before income taxes	20,617,000	17,547,000	37,616,000	35,253,000
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	71,509,000	67,788,000	142,534,000	136,112,000
Provision for loan losses	323,000	(617,000)	(60,000)	(128,000)
Non-interest income	47,542,000	45,105,000	94,659,000	89,611,000
Investment securities gains (losses), net	0	0	0	0
Non-interest expense	(62,166,000)	(59,080,000)	(122,992,000)	(117,992,000)
Income before income taxes	57,208,000	53,196,000	114,141,000	107,603,000
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	10,018,000	9,938,000	19,930,000	20,112,000
Provision for loan losses	533,000	(92,000)	492,000	(140,000)
Non-interest income	31,497,000	29,760,000	61,486,000	58,579,000
Investment securities gains (losses), net	0	0	0	0
Non-interest expense	(23,935,000)	(23,649,000)	(48,684,000)	(47,957,000)
Income before income taxes	18,113,000	15,957,000	33,224,000	30,594,000
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	149,259,000	144,628,000	297,058,000	290,339,000
Provision for loan losses	(7,467,000)	(9,379,000)	(17,111,000)	(17,149,000)
Non-interest income	107,750,000	103,141,000	210,500,000	203,074,000
Investment securities gains (losses), net	0	0	0	0
Non-interest expense	(153,604,000)	(151,690,000)	(305,466,000)	(302,814,000)
Income before income taxes	95,938,000	86,700,000	184,981,000	173,450,000
Other Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	11,234,000	14,830,000	16,501,000	19,462,000
Provision for loan losses	(88,000)	2,000,000	(104,000)	6,485,000
Non-interest income	1,013,000	(465,000)	890,000	(521,000)
Investment securities gains (losses), net	(2,558,000)	(1,568,000)	7,479,000	(3,733,000)
Non-interest expense	(9,327,000)	(5,276,000)	(19,805,000)	(9,189,000)
Income before income taxes	$ 274,000	$ 9,521,000	$ 4,961,000	$ 12,504,000