Segment Information (Summary Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Interest income	$ 225,453	$ 231,788	$ 459,517	$ 460,859
Interest expense	16,255	14,322	32,617	28,274
Net interest income	209,198	217,466	426,900	432,585
Provision for loan and lease losses	10,589	11,254	15,412	23,891
Non-interest income	74,659	81,102	120,610	145,007
Non-interest expense	188,511	201,918	372,500	394,537
Income before provision for income taxes	84,757	85,396	159,598	159,164
Provision for income taxes	30,470	30,612	57,742	57,251
Net income	54,287	54,784	101,856	101,913	$ 222,539
Total assets	24,132,507		24,132,507		23,406,381
Total loans and leases	17,355,240		17,355,240		16,866,536
Total deposits	18,258,474		18,258,474		17,707,189
Community Banking
Segment Reporting Information [Line Items]
Interest income	195,594	206,007	400,120	412,846
Interest expense	14,404	12,192	28,939	24,211
Net interest income	181,190	193,815	371,181	388,635
Provision for loan and lease losses	11,493	9,344	17,473	21,773
Non-interest income	33,714	33,573	63,922	62,838
Non-interest expense	153,987	169,136	309,361	333,882
Income before provision for income taxes	49,424	48,908	108,269	95,818
Provision for income taxes	17,768	17,549	39,171	33,743
Net income	31,656	31,359	69,098	62,075
Total assets	20,812,211		20,812,211		20,214,498
Total loans and leases	14,723,290		14,723,290		14,183,919
Total deposits	18,003,950		18,003,950		17,689,815
Home Lending
Segment Reporting Information [Line Items]
Interest income	29,859	25,781	59,397	48,013
Interest expense	1,851	2,130	3,678	4,063
Net interest income	28,008	23,651	55,719	43,950
Provision for loan and lease losses	(904)	1,910	(2,061)	2,118
Non-interest income	40,945	47,529	56,688	82,169
Non-interest expense	34,524	32,782	63,139	60,655
Income before provision for income taxes	35,333	36,488	51,329	63,346
Provision for income taxes	12,702	13,063	18,571	23,508
Net income	22,631	$ 23,425	32,758	$ 39,838
Total assets	3,320,296		3,320,296		3,191,883
Total loans and leases	2,631,950		2,631,950		2,682,617
Total deposits	$ 254,524		$ 254,524		$ 17,374