Segment Information (Summary Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Interest income	$ 242,151	$ 239,523	$ 224,967	$ 115,880	$ 118,538	$ 115,960	$ 104,015	$ 104,333	$ 822,521	$ 442,846	$ 456,085
Interest expense	14,136	13,807	12,708	8,042	8,464	9,151	10,122	10,144	48,693	37,881	48,849
Net interest income	228,015	225,716	212,259	107,838	110,074	106,809	93,893	94,189	773,828	404,965	407,236
Provision for loan and lease losses	5,241	14,333	14,696	5,971	2,471	1,104	(79)	7,220	40,241	10,716	29,201
Non-interest income	49,832	61,924	44,529	23,007	26,785	26,144	34,497	34,015	179,292	121,441	136,829
Non-interest expense	190,856	182,558	214,131	96,518	95,364	95,604	87,931	85,762	684,063	364,661	359,652
Income before income taxes	81,750	90,749	27,961	28,356	39,024	36,245	40,538	35,222	228,816	151,029	155,212
Provision for income taxes	29,204	31,760	10,740	9,592	13,754	12,768	14,285	11,861	81,296	52,668	53,321
Net income	52,546	58,989	17,221	18,764	25,270	23,477	26,253	23,361	147,520	98,361	101,891
Net earnings available to common shareholders	146	142	83	113	212	196	197	183	484	788	682
Net earnings available to common shareholders	52,400	58,847	17,138	18,651	25,058	23,281	26,056	23,178	147,036	97,573	101,209
Total assets	22,613,274				11,636,112				22,613,274	11,636,112	11,795,443
Total loans and leases (covered and non-covered)	15,327,732				7,728,166				15,327,732	7,728,166	7,176,433
Total deposits	16,892,099				9,117,660				16,892,099	9,117,660	9,379,275
Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income									755,374	420,854	435,814
Interest expense									43,077	35,367	46,105
Net interest income									712,297	385,487	389,709
Provision for loan and lease losses									40,241	10,716	29,201
Non-interest income									91,295	42,102	52,031
Non-interest expense									615,275	325,743	322,197
Income before income taxes									148,076	91,130	90,342
Provision for income taxes									52,683	28,708	27,373
Net income									95,393	62,422	62,969
Net earnings available to common shareholders									484	788	682
Net earnings available to common shareholders									94,909	61,634	62,287
Total assets	20,098,560				10,949,050				20,098,560	10,949,050	11,075,366
Total loans and leases (covered and non-covered)	13,181,463				7,196,137				13,181,463	7,196,137	6,806,199
Total deposits	16,850,682				9,090,959				16,850,682	9,090,959	9,350,900
Home Lending [Member]
Segment Reporting Information [Line Items]
Interest income									67,147	21,992	20,271
Interest expense									5,616	2,514	2,744
Net interest income									61,531	19,478	17,527
Provision for loan and lease losses									0	0	0
Non-interest income									87,997	79,339	84,798
Non-interest expense									68,788	38,918	37,455
Income before income taxes									80,740	59,899	64,870
Provision for income taxes									28,613	23,960	25,948
Net income									52,127	35,939	38,922
Net earnings available to common shareholders									0	0	0
Net earnings available to common shareholders									52,127	35,939	38,922
Total assets	2,514,714				687,062				2,514,714	687,062	720,077
Total loans and leases (covered and non-covered)	2,146,269				532,029				2,146,269	532,029	370,234
Total deposits	$ 41,417				$ 26,701				$ 41,417	$ 26,701	$ 28,375