Segment Information (Summary Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income	$ 206,725	$ 217,702
Provision for loan and lease losses	11,672	4,823
Non-interest income	60,225	45,951
Non-interest expense	182,714	183,989
Income before provision for income taxes	72,564	74,841
Provision for income taxes	26,561	27,272
Net income	46,003	47,569	$ 232,940
Total assets	24,861,458		24,813,119
Loans and leases	17,829,638	16,955,583	17,508,663
Total deposits	19,167,293		19,020,985
Commercial Bank
Segment Reporting Information [Line Items]
Net interest income	102,497	102,857
Net income	35,283
Total assets	13,081,521		12,829,249
Loans and leases	12,903,317		12,640,383
Total deposits	3,367,310		3,288,837
Wealth Management
Segment Reporting Information [Line Items]
Net interest income	4,429	5,013
Net income	383
Total assets	439,496		437,058
Loans and leases	417,530		415,737
Total deposits	1,018,767		1,011,454
Retail Bank
Segment Reporting Information [Line Items]
Net interest income	68,044	65,885
Net income	4,655
Total assets	1,915,816		1,893,433
Loans and leases	1,841,187		1,806,554
Total deposits	12,331,062		12,032,906
Home Lending
Segment Reporting Information [Line Items]
Net interest income	9,498	8,192
Net income	(2,920)
Total assets	3,231,422		3,243,600
Loans and leases	2,693,514		2,685,181
Total deposits	248,149		229,358
Corporate & Other
Segment Reporting Information [Line Items]
Net interest income	22,257	35,755
Net income	8,602
Total assets	6,193,203		6,409,779
Loans and leases	(25,910)		(39,192)
Total deposits	2,202,005		$ 2,458,430
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net income		47,569
Operating Segments [Member] | Commercial Bank
Segment Reporting Information [Line Items]
Net income		39,652
Operating Segments [Member] | Wealth Management
Segment Reporting Information [Line Items]
Net income		16
Operating Segments [Member] | Retail Bank
Segment Reporting Information [Line Items]
Net income		974
Operating Segments [Member] | Home Lending
Segment Reporting Information [Line Items]
Net income		(9,094)
Operating Segments [Member] | Corporate & Other
Segment Reporting Information [Line Items]
Net income		16,021
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Provision for loan and lease losses	11,672	4,823
Non-interest income	60,225	45,951
Non-interest expense	182,714	183,989
Income before provision for income taxes	72,564	74,841
Provision for income taxes	26,561	27,272
Intersegment Eliminations [Member] | Commercial Bank
Segment Reporting Information [Line Items]
Provision for loan and lease losses	9,109	3,315
Non-interest income	12,474	9,122
Non-interest expense	49,857	45,725
Income before provision for income taxes	56,005	62,939
Provision for income taxes	20,722	23,287
Intersegment Eliminations [Member] | Wealth Management
Segment Reporting Information [Line Items]
Provision for loan and lease losses	200	298
Non-interest income	4,748	4,561
Non-interest expense	8,369	9,250
Income before provision for income taxes	608	26
Provision for income taxes	225	10
Intersegment Eliminations [Member] | Retail Bank
Segment Reporting Information [Line Items]
Provision for loan and lease losses	1,816	2,035
Non-interest income	14,831	14,712
Non-interest expense	73,670	77,016
Income before provision for income taxes	7,389	1,546
Provision for income taxes	2,734	572
Intersegment Eliminations [Member] | Home Lending
Segment Reporting Information [Line Items]
Provision for loan and lease losses	27	(1,428)
Non-interest income	26,880	15,743
Non-interest expense	40,986	39,798
Income before provision for income taxes	(4,635)	(14,435)
Provision for income taxes	(1,715)	(5,341)
Intersegment Eliminations [Member] | Corporate & Other
Segment Reporting Information [Line Items]
Provision for loan and lease losses	520	603
Non-interest income	1,292	1,813
Non-interest expense	9,832	12,200
Income before provision for income taxes	13,197	24,765
Provision for income taxes	$ 4,595	$ 8,744