Segment Information (Summary Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income	$ 220,464	$ 209,892	$ 639,267	$ 636,792
Provision for loan and lease losses	11,997	13,091	34,326	28,503
Non-interest income	75,402	80,710	206,746	201,320
Non-interest expense	188,354	181,187	555,089	553,687
Income before provision for income taxes	95,515	96,324	256,598	255,922
Provision for income taxes	34,182	34,515	92,450	92,257
Net income	61,333	61,809	164,148	163,665	$ 232,940
Total assets	25,695,663		25,695,663		24,813,119
Loans and leases	18,677,762	17,392,051	18,677,762	17,392,051	17,508,663
Total deposits	19,851,910		19,851,910		19,020,985
Commercial Bank
Segment Reporting Information [Line Items]
Net interest income	110,499	105,827	320,561	313,832
Provision for loan and lease losses	9,166	9,054	26,059	21,830
Non-interest income	12,703	9,478	40,163	29,748
Non-interest expense	53,830	50,237	160,040	149,737
Income before provision for income taxes	60,206	56,014	174,625	172,013
Provision for income taxes	22,276	20,725	64,611	63,645
Net income	37,930	35,289	110,014	108,368
Total assets	13,594,329		13,594,329		12,829,249
Loans and leases	13,414,523		13,414,523		12,640,383
Total deposits	3,737,068		3,737,068		3,288,837
Wealth Management
Segment Reporting Information [Line Items]
Net interest income	5,609	5,442	16,251	16,010
Provision for loan and lease losses	107	234	482	602
Non-interest income	4,462	4,800	13,689	14,519
Non-interest expense	8,723	8,760	25,570	27,060
Income before provision for income taxes	1,241	1,248	3,888	2,867
Provision for income taxes	459	462	1,438	1,061
Net income	782	786	2,450	1,806
Total assets	456,114		456,114		437,058
Loans and leases	441,727		441,727		415,737
Total deposits	1,023,661		1,023,661		1,011,454
Retail Bank
Segment Reporting Information [Line Items]
Net interest income	72,529	63,568	208,482	187,168
Provision for loan and lease losses	1,999	2,732	6,667	6,310
Non-interest income	16,038	16,301	46,539	46,932
Non-interest expense	69,159	71,169	215,534	220,804
Income before provision for income taxes	17,409	5,968	32,820	6,986
Provision for income taxes	6,443	2,208	12,144	2,585
Net income	10,966	3,760	20,676	4,401
Total assets	2,060,076		2,060,076		1,893,433
Loans and leases	1,977,641		1,977,641		1,806,554
Total deposits	12,471,328		12,471,328		12,032,906
Home Lending
Segment Reporting Information [Line Items]
Net interest income	10,191	11,177	29,461	30,369
Provision for loan and lease losses	855	829	1,142	(1,669)
Non-interest income	38,855	48,292	100,372	104,980
Non-interest expense	37,454	40,688	110,634	116,596
Income before provision for income taxes	10,737	17,952	18,057	20,422
Provision for income taxes	3,973	6,642	6,681	7,556
Net income	6,764	11,310	11,376	12,866
Total assets	3,436,392		3,436,392		3,243,600
Loans and leases	2,855,875		2,855,875		2,685,181
Total deposits	332,686		332,686		229,358
Corporate & Other
Segment Reporting Information [Line Items]
Net interest income	21,636	23,878	64,512	89,413
Provision for loan and lease losses	(130)	242	(24)	1,430
Non-interest income	3,344	1,839	5,983	5,141
Non-interest expense	19,188	10,333	43,311	39,490
Income before provision for income taxes	5,922	15,142	27,208	53,634
Provision for income taxes	1,031	4,478	7,576	17,410
Net income	4,891	$ 10,664	19,632	$ 36,224
Total assets	6,148,752		6,148,752		6,409,779
Loans and leases	(12,004)		(12,004)		(39,192)
Total deposits	$ 2,287,167		$ 2,287,167		$ 2,458,430