Segment Information (Summary Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Interest income	$ 229,860	$ 115,880
Interest expense	13,952	8,042
Net interest income	215,908	107,838
Provision for loan and lease losses	12,637	5,971
Non-interest income	63,595	23,238
Non-interest expense	193,098	96,518
Income before income taxes	73,768	28,587
Provision for income taxes	26,639	9,936
Net income	47,129	18,651	147,658
Dividends and undistributed earnings allocated to participating securities	84	113
Net earnings available to common shareholders	47,045	18,538
Total assets	22,953,158		22,609,903
Total loans and leases	15,548,957		15,327,732
Total deposits	17,222,566		16,892,099
Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	207,628	110,156
Interest expense	12,019	7,488
Net interest income	195,609	102,668
Provision for loan and lease losses	12,637	5,971
Non-interest income	28,955	12,718
Non-interest expense	167,092	89,334
Income before income taxes	44,835	20,081
Provision for income taxes	16,194	6,534
Net income	28,641	13,547
Dividends and undistributed earnings allocated to participating securities	84	113
Net earnings available to common shareholders	28,557	13,434
Total assets	20,262,775		20,095,189
Total loans and leases	13,339,829		13,181,463
Total deposits	17,160,722		16,850,682
Home Lending [Member]
Segment Reporting Information [Line Items]
Interest income	22,232	5,724
Interest expense	1,933	554
Net interest income	20,299	5,170
Provision for loan and lease losses	0	0
Non-interest income	34,640	10,520
Non-interest expense	26,006	7,184
Income before income taxes	28,933	8,506
Provision for income taxes	10,445	3,402
Net income	18,488	5,104
Dividends and undistributed earnings allocated to participating securities	0	0
Net earnings available to common shareholders	18,488	5,104
Total assets	2,690,383		2,514,714
Total loans and leases	2,209,128		2,146,269
Total deposits	$ 61,844		$ 41,417