Loans (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Loans, net of unearned income
Total commercial	$ 3,800,230	$ 1,081,621
Total construction	1,263,005	652,857
Total real estate	2,998,923	1,413,287
Total residential mortgage loans	1,507,498	659,689
Total consumer loans	1,607,370	1,149,710
Total Loans	11,177,026	4,957,164
Originated loans [Member]
Loans, net of unearned income
Total commercial	1,525,409	1,046,431
Total construction	540,806	495,590
Total real estate	1,259,757	1,231,414
Total residential mortgage loans	487,147	366,183
Total consumer loans	1,074,611	1,008,395
Total Loans	4,887,730	4,148,013
Acquired loans [Member]
Loans, net of unearned income
Total commercial	2,236,758	0
Total construction	603,371	0
Total real estate	1,656,515	0
Total residential mortgage loans	734,669	0
Total consumer loans	386,540	0
Total Loans	5,617,853	0
Covered loans [Member]
Loans, net of unearned income
Total commercial	38,063	35,190
Total construction	118,828	157,267
Total real estate	82,651	181,873
Total residential mortgage loans	285,682	293,506
Total consumer loans	146,219	141,315
Total Loans	$ 671,443	$ 809,151