Non-covered Loans and Leases (Schedule of Major Types of Non-covered Loans) (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Non-covered Loans and Leases
Commercial real estate, Term & multifamily	$ 3,532,134,000	$ 3,483,475,000
Commercial real estate, Construction & development	184,707,000	247,814,000
Commercial real estate, Residential development	112,657,000	147,813,000
Commercial, Term	572,402,000	509,453,000
Commercial, LOC & other	788,268,000	747,419,000
Residential, Mortgage	245,034,000	222,416,000
Residential, Home equity loans & lines	277,453,000	278,585,000
Consumer & other	34,584,000	33,043,000
Total	5,747,239,000	5,670,018,000
Deferred loan fees, net	(11,686,000)	(11,031,000)
Total loans and leases	5,735,553,000	5,658,987,000
Total loans pledged to secure borrowings	$ 3,500,000,000