Segments (Schedule Of Financial Information By Segment) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Segment Reporting Information, Intersegment Revenue	$ 0
Number of operating segments	3
Net interest income	150,343,000	159,737,000
Provision for loan losses	(3,285,000)	(8,165,000)
Non-interest income	99,877,000	94,583,000
Investment securities gains (losses), net	(2,165,000)	4,040,000
Non-interest expense	(155,037,000)	(150,461,000)
Income before income taxes	89,733,000	99,734,000
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	67,213,000	69,093,000
Provision for loan losses	(8,211,000)	(9,307,000)
Non-interest income	26,725,000	27,188,000
Investment securities gains (losses), net	0	0
Non-interest expense	(67,911,000)	(66,115,000)
Income before income taxes	17,816,000	20,859,000
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	70,959,000	71,529,000
Provision for loan losses	489,000	(1,831,000)
Non-interest income	44,506,000	42,894,000
Investment securities gains (losses), net	0	0
Non-interest expense	(58,907,000)	(55,969,000)
Income before income taxes	57,047,000	56,623,000
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	10,330,000	9,757,000
Provision for loan losses	(48,000)	(42,000)
Non-interest income	28,703,000	26,155,000
Investment securities gains (losses), net	0	0
Non-interest expense	(24,308,000)	(22,767,000)
Income before income taxes	14,677,000	13,103,000
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	148,502,000	150,379,000
Provision for loan losses	(7,770,000)	(11,180,000)
Non-interest income	99,934,000	96,237,000
Investment securities gains (losses), net	0	0
Non-interest expense	(151,126,000)	(144,851,000)
Income before income taxes	89,540,000	90,585,000
Other/ Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	1,841,000	9,358,000
Provision for loan losses	4,485,000	3,015,000
Non-interest income	(57,000)	(1,654,000)
Investment securities gains (losses), net	(2,165,000)	4,040,000
Non-interest expense	(3,911,000)	(5,610,000)
Income before income taxes	$ 193,000	$ 9,149,000