Covered Assets And Indemnification Asset (Internal Risk Rating By Loan Class) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Commercial real estate, Term & multifamily	$ 3,558,295	$ 3,483,475
Commercial real estate, Construction & development	165,066	247,814
Commercial real estate, Residential development	90,073	147,813
Commercial, Term	625,766	509,453
Commercial, LOC & other	832,999	747,419
Residential, Mortgage	315,927	222,416
Residential, Home equity loans & lines	272,192	278,585
Consumer & other	38,860	33,043
Total	5,899,178	5,670,018
Covered Loans [Member]
Commercial real estate, Term & multifamily	468,747	569,642
Commercial real estate, Construction & development	13,105	22,435
Commercial real estate, Residential development	15,794	24,706
Commercial, Term	31,139	42,600
Commercial, LOC & other	22,524	35,227
Residential, Mortgage	35,233	44,824
Residential, Home equity loans & lines	28,366	35,625
Consumer & other	7,543	10,839
Total	622,451	785,898
Covered Loans [Member] | Pass/Watch [Member]
Commercial real estate, Term & multifamily	329,273	485,238
Commercial real estate, Construction & development	1,552	6,155
Commercial real estate, Residential development	1,187	6,625
Commercial, Term	18,006	31,760
Commercial, LOC & other	13,605	22,960
Residential, Mortgage	35,233	44,524
Residential, Home equity loans & lines	28,223	34,998
Consumer & other	7,543	10,827
Total	434,622	643,087
Covered Loans [Member] | Special Mention [Member]
Commercial real estate, Term & multifamily	58,610	32,150
Commercial real estate, Construction & development	1,410	3,799
Commercial real estate, Residential development	405	1,322
Commercial, Term	1,661	2,119
Commercial, LOC & other	2,756	4,246
Total	64,842	43,636
Covered Loans [Member] | Substandard [Member]
Commercial real estate, Term & multifamily	68,521	44,833
Commercial real estate, Construction & development	6,733	7,640
Commercial real estate, Residential development	8,394	12,907
Commercial, Term	8,244	7,087
Commercial, LOC & other	5,607	7,183
Residential, Mortgage		300
Residential, Home equity loans & lines	143	627
Consumer & other		12
Total	97,642	80,589
Covered Loans [Member] | Doubtful [Member]
Commercial real estate, Term & multifamily	12,343	7,421
Commercial real estate, Construction & development	3,410	4,841
Commercial real estate, Residential development	5,808	3,852
Commercial, Term	3,228	1,634
Commercial, LOC & other	556	838
Total	$ 25,345	$ 18,586