Segment Information (Summary of Financial Information by Reportable Segment) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Dec. 31, 2009
Interest income	$ 128,417	$ 115,604	$ 253,309	$ 224,973
Interest expense	19,056	23,304	39,046	45,621
Net interest income	109,361	92,300	214,263	179,352
Provision	15,459	29,767	30,489	71,873
Provision for covered loan and lease losses	3,755		11,023
Non-interest income	19,627	18,563	41,212	48,610
Non-interest expense	83,207	74,833	167,408	144,704
Income (loss) before income taxes	26,567	6,263	46,555	11,385
Provision for income taxes	8,782	2,800	15,303	(592)
Net income (loss)	17,785	3,463	31,252	11,977	28,326
Preferred stock dividends				12,192	3,686
Dividends and undistributed earnings allocated to participating securities	86	16	148	31
Net earnings (loss) available to common shareholders	17,699	3,447	31,104	(246)
Total assets	11,459,692		11,459,692		11,668,710	15,000,000
Total loans and leases (covered and non-covered)	6,434,229		6,434,229		6,444,885
Total deposits	9,146,412		9,146,412		9,433,805
Community Banking [Member]
Interest income	121,953	110,109	241,010	214,209
Interest expense	18,019	22,360	36,831	43,687
Net interest income	103,934	87,749	204,179	170,522
Provision	15,459	29,767	30,489	71,873
Provision for covered loan and lease losses	3,755		11,023
Non-interest income	11,092	11,771	23,768	35,218
Non-interest expense	74,952	67,332	150,711	130,362
Income (loss) before income taxes	20,860	2,421	35,724	3,505
Provision for income taxes	6,381	1,374	11,174	(3,504)
Net income (loss)	14,479	1,047	24,550	7,009
Preferred stock dividends				12,192
Dividends and undistributed earnings allocated to participating securities	86	16	148	31
Net earnings (loss) available to common shareholders	14,393	1,031	24,402	(5,214)
Total assets	11,092,529		11,092,529		11,314,681
Total loans and leases (covered and non-covered)	6,161,711		6,161,711		6,198,532
Total deposits	8,859,870		8,859,870		9,160,058
Wealth Management [Member]
Interest income	3,304	2,427	5,771	4,821
Interest expense	465	307	1,045	602
Net interest income	2,839	2,120	4,726	4,219
Non-interest income	3,671	3,540	7,267	6,631
Non-interest expense	3,941	4,087	8,043	7,863
Income (loss) before income taxes	2,569	1,573	3,950	2,987
Provision for income taxes	1,146	519	1,377	955
Net income (loss)	1,423	1,054	2,573	2,032
Dividends and undistributed earnings allocated to participating securities
Net earnings (loss) available to common shareholders	1,423	1,054	2,573	2,032
Total assets	48,885		48,885		37,757
Total loans and leases (covered and non-covered)	34,514		34,514		23,631
Total deposits	267,037		267,037		262,148
Mortgage Banking [Member]
Interest income	3,160	3,068	6,528	5,943
Interest expense	572	637	1,170	1,332
Net interest income	2,588	2,431	5,358	4,611
Non-interest income	4,864	3,252	10,177	6,761
Non-interest expense	4,314	3,414	8,654	6,479
Income (loss) before income taxes	3,138	2,269	6,881	4,893
Provision for income taxes	1,255	907	2,752	1,957
Net income (loss)	1,883	1,362	4,129	2,936
Dividends and undistributed earnings allocated to participating securities
Net earnings (loss) available to common shareholders	1,883	1,362	4,129	2,936
Total assets	318,278		318,278		316,272
Total loans and leases (covered and non-covered)	238,004		238,004		222,722
Total deposits	$ 19,505		$ 19,505		$ 11,599