Segments (Schedule Of Financial Information By Segment) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Segment Reporting Information, Intersegment Revenue	$ 0	$ 0
Number of operating segments	3	3
Net interest income	153,066,000	150,343,000
Provision for loan losses	(9,660,000)	(3,285,000)
Non-interest income	102,627,000	99,877,000
Investment securities gains (losses), net	10,037,000	(2,165,000)
Non-interest expense	(162,340,000)	(155,037,000)
Income before income taxes	93,730,000	89,733,000
Consumer Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	66,862,000	67,213,000
Provision for loan losses	(9,220,000)	(8,211,000)
Non-interest income	25,644,000	26,608,000
Investment securities gains (losses), net	0	0
Non-interest expense	(66,287,000)	(67,904,000)
Income before income taxes	16,999,000	17,706,000
Commercial Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	73,401,000	70,215,000
Provision for loan losses	(383,000)	489,000
Non-interest income	47,117,000	44,506,000
Investment securities gains (losses), net	0	0
Non-interest expense	(60,826,000)	(58,912,000)
Income before income taxes	59,309,000	56,298,000
Wealth Segment [Member]
Segment Reporting Information [Line Items]
Net interest income	9,912,000	10,174,000
Provision for loan losses	(41,000)	(48,000)
Non-interest income	29,989,000	28,819,000
Investment securities gains (losses), net	0	0
Non-interest expense	(24,749,000)	(24,308,000)
Income before income taxes	15,111,000	14,637,000
Segment Totals [Member]
Segment Reporting Information [Line Items]
Net interest income	150,175,000	147,602,000
Provision for loan losses	(9,644,000)	(7,770,000)
Non-interest income	102,750,000	99,933,000
Investment securities gains (losses), net	0	0
Non-interest expense	(151,862,000)	(151,124,000)
Income before income taxes	91,419,000	88,641,000
Other/ Elimination [Member]
Segment Reporting Information [Line Items]
Net interest income	2,891,000	2,741,000
Provision for loan losses	(16,000)	4,485,000
Non-interest income	(123,000)	(56,000)
Investment securities gains (losses), net	10,037,000	(2,165,000)
Non-interest expense	(10,478,000)	(3,913,000)
Income before income taxes	$ 2,311,000	$ 1,092,000