Operating Segments (Summary Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Interest income	$ 121,917	$ 126,527	$ 128,417	$ 124,892	$ 130,677	$ 132,946	$ 115,604	$ 109,369	$ 501,753	$ 488,596	$ 423,732
Interest expense	15,262	18,993	19,056	19,990	23,562	24,629	23,304	22,317	73,301	93,812	103,024
Net interest income	106,655	107,534	109,361	104,902	107,115	108,317	92,300	87,052	428,452	394,784	320,708
Provision for non-covered loan and lease losses	6,642	9,089	15,459	15,030	17,567	24,228	29,767	42,106	46,220	113,668	209,124
Provision for covered loan and lease losses									16,141	5,151
Non-interest income	18,128	24,778	19,627	21,585	15,161	12,133	18,563	30,047	84,118	75,904	73,516
Non-interest expense	85,339	86,224	83,207	84,201	87,864	85,170	74,833	69,871	338,971	317,738	379,403
(Loss) income before (benefit from) provision for income taxes	32,104	32,579	26,567	19,988	12,361	10,385	6,263	5,122	111,238	34,131	(194,303)
(Benefit from) provision for income taxes	10,722	10,717	8,782	6,521	4,203	2,194	2,800	(3,392)	36,742	5,805	(40,937)
Net income	21,382	21,862	17,785	13,467	8,158	8,191	3,463	8,514	74,496	28,326	(153,366)
Preferred stock dividends										3,686	10,739
Dividends and undistributed earnings allocated to participating securities									356	67	30
Net earnings (loss) available to common shareholders	21,279	21,757	17,699	13,405	8,140	8,173	3,447	(3,693)	74,140	16,067	(166,262)
Total assets	11,563,355				11,668,710				11,563,355	11,668,710	9,381,372
Total loans (covered and non-covered)	6,510,549				6,444,885				6,510,549	6,444,885	5,999,267
Total deposits	9,236,690				9,433,805				9,236,690	9,433,805	7,440,434
Community Banking [Member]
Interest income									474,167	466,054	406,460
Interest expense									68,751	89,622	99,382
Net interest income									405,416	376,432	307,078
Provision for non-covered loan and lease losses									46,220	113,668	209,124
Provision for covered loan and lease losses									16,141	5,151
Non-interest income									43,282	41,534	45,280
Non-interest expense									302,883	286,629	352,290
(Loss) income before (benefit from) provision for income taxes									83,454	12,518	(209,056)
(Benefit from) provision for income taxes									26,023	(2,342)	(46,383)
Net income									57,431	14,860	(162,673)
Dividends and undistributed earnings allocated to participating securities									356	67	30
Net earnings (loss) available to common shareholders									57,075	2,601	(175,569)
Total assets	11,086,493				11,314,681				11,086,493	11,314,681	9,109,542
Total loans (covered and non-covered)	6,171,368				6,198,532				6,171,368	6,198,532	5,789,730
Total deposits	8,830,353				9,160,058				8,830,353	9,160,058	7,432,549
Wealth Management [Member]
Interest income									13,362	9,978	4,467
Interest expense									2,067	1,435	1
Net interest income									11,295	8,543	4,466
Non-interest income									13,963	12,967	9,344
Non-interest expense									15,630	15,503	12,910
(Loss) income before (benefit from) provision for income taxes									9,628	6,007	900
(Benefit from) provision for income taxes									3,457	1,905	(95)
Net income									6,171	4,102	995
Net earnings (loss) available to common shareholders									6,171	4,102	995
Total assets	53,044				37,757				53,044	37,757	31,196
Total loans (covered and non-covered)	38,810				23,631				38,810	23,631	17,484
Total deposits	390,992				262,148				390,992	262,148	98
Mortgage Banking [Member]
Interest income									14,224	12,564	12,805
Interest expense									2,483	2,755	3,641
Net interest income									11,741	9,809	9,164
Non-interest income									26,873	21,403	18,892
Non-interest expense									20,458	15,606	14,203
(Loss) income before (benefit from) provision for income taxes									18,156	15,606	13,853
(Benefit from) provision for income taxes									7,262	6,242	5,541
Net income									10,894	9,364	8,312
Net earnings (loss) available to common shareholders									10,894	9,364	8,312
Total assets	423,818				316,272				423,818	316,272	240,634
Total loans (covered and non-covered)	300,371				222,722				300,371	222,722	192,053
Total deposits	$ 15,345				$ 11,599				$ 15,345	$ 11,599	$ 7,787