Segment Information (Summary Of Financial Information By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Segment Reporting Information [Line Items]
Interest income	$ 115,642	$ 124,892
Interest expense	13,287	19,990
Net interest income	102,355	104,902
Provision for non-covered loan and lease losses	3,167	15,030
Provision for covered loan losses	(31)	7,268
Non-interest income	27,237	21,585
Non-interest expense	87,696	84,201
Income before income taxes	38,760	19,988
Provision for income taxes	13,257	6,521
Net income	25,503	13,467	74,496
Dividends and undistributed earnings allocated to participating securities	167	62
Net earnings available to common shareholders	25,336	13,405
Total assets	11,453,178	11,563,355	11,563,355
Total loans and leases (covered and non-covered)	6,534,449	6,510,549
Total deposits	9,115,165	9,236,690	9,236,690
Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	107,280	119,057
Interest expense	12,421	18,812
Net interest income	94,859	100,245
Provision for non-covered loan and lease losses	3,167	15,030
Provision for covered loan losses	(31)	7,268
Non-interest income	10,864	12,676
Non-interest expense	76,719	75,759
Income before income taxes	25,868	14,864
Provision for income taxes	8,222	4,793
Net income	17,646	10,071
Dividends and undistributed earnings allocated to participating securities	167	62
Net earnings available to common shareholders	17,479	10,009
Total assets	10,914,373	11,086,493
Total loans and leases (covered and non-covered)	6,164,409	6,171,368
Total deposits	8,695,833	8,830,353
Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income	4,118	2,467
Interest expense	267	580
Net interest income	3,851	1,887
Non-interest income	3,090	3,596
Non-interest expense	3,729	4,102
Income before income taxes	3,212	1,381
Provision for income taxes	1,163	231
Net income	2,049	1,150
Net earnings available to common shareholders	2,049	1,150
Total assets	57,957	53,044
Total loans and leases (covered and non-covered)	43,878	38,810
Total deposits	399,091	390,992
Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Interest income	4,244	3,368
Interest expense	599	598
Net interest income	3,645	2,770
Non-interest income	13,283	5,313
Non-interest expense	7,248	4,340
Income before income taxes	9,680	3,743
Provision for income taxes	3,872	1,497
Net income	5,808	2,246
Net earnings available to common shareholders	5,808	2,246
Total assets	480,848	423,818
Total loans and leases (covered and non-covered)	326,162	300,371
Total deposits	$ 20,241	$ 15,345