Segment Information (Summary Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Interest income	$ 234,317	$ 239,523	$ 696,647	$ 580,370
Interest expense	14,587	13,807	42,861	34,557
Net interest income	219,730	225,716	653,786	545,813
Provision for loan and lease losses	8,153	14,333	32,044	35,000
Non-interest income	60,349	62,165	204,343	130,869
Non-interest expense	182,686	182,558	577,681	493,207
Income before provision for income taxes	89,240	90,990	248,404	148,475
Provision for income taxes	31,633	32,107	88,884	53,399
Net income	57,607	58,883	159,520	95,076	$ 147,658
Total assets	23,162,304		23,162,304		22,609,903
Total loans and leases	16,387,934		16,387,934		15,327,732
Total deposits	17,467,024		17,467,024		16,892,099
Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	204,393	219,268	618,710	536,922
Interest expense	12,269	12,003	36,480	30,858
Net interest income	192,124	207,265	582,230	506,064
Provision for loan and lease losses	7,294	14,333	29,067	35,000
Non-interest income	32,020	30,439	93,845	64,072
Non-interest expense	152,174	160,559	486,514	445,189
Income before provision for income taxes	64,676	62,812	160,494	89,947
Provision for income taxes	22,925	22,165	57,430	32,353
Net income	41,751	40,647	103,064	57,594
Total assets	20,115,935		20,115,935		20,095,189
Total loans and leases	13,825,307		13,825,307		13,181,463
Total deposits	17,371,561		17,371,561		16,850,682
Home Lending [Member]
Segment Reporting Information [Line Items]
Interest income	29,924	20,255	77,937	43,448
Interest expense	2,318	1,804	6,381	3,699
Net interest income	27,606	18,451	71,556	39,749
Provision for loan and lease losses	859	0	2,977	0
Non-interest income	28,329	31,726	110,498	66,797
Non-interest expense	30,512	21,999	91,167	48,018
Income before provision for income taxes	24,564	28,178	87,910	58,528
Provision for income taxes	8,708	9,942	31,454	21,046
Net income	15,856	$ 18,236	56,456	$ 37,482
Total assets	3,046,369		3,046,369		2,514,714
Total loans and leases	2,562,627		2,562,627		2,146,269
Total deposits	$ 95,463		$ 95,463		$ 41,417