Allowance For Non-Covered Loan Loss And Credit Quality (Non-Covered Non-Accrual Loans And Loans Past Due) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Deferred loan fees, net	$ (11,384)	$ (11,080)
Non-covered loans and leases	5,941,270	5,888,098
Total Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	14,371	19,774
60-89 Days Past Due	6,459	15,453
Greater Than 90 Days and Accruing	5,520	10,821
Total Past Due	26,350	46,048
Nonaccrual	80,521	80,562
Current	5,845,783	5,772,568
Total Non-covered Loans and Leases	5,952,654	5,899,178
Commercial [Member] | Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	798	2,075
60-89 Days Past Due	289	738
Greater Than 90 Days and Accruing	62	1,179
Total Past Due	1,149	3,992
Nonaccrual	10,063	8,120
Current	676,030	613,654
Total Non-covered Loans and Leases	687,242	625,766
Commercial [Member] | LOC & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,940	5,435
60-89 Days Past Due	910	1,697
Greater Than 90 Days and Accruing	1,305	1,397
Total Past Due	4,155	8,529
Nonaccrual	9,666	8,772
Current	750,228	815,698
Total Non-covered Loans and Leases	764,049	832,999
Commercial Real Estate [Member] | Term & Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	7,786	7,319
60-89 Days Past Due	4,293	11,184
Greater Than 90 Days and Accruing	437
Total Past Due	12,516	18,503
Nonaccrual	45,580	44,486
Current	3,558,290	3,495,306
Total Non-covered Loans and Leases	3,616,386	3,558,295
Commercial Real Estate [Member] | Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
60-89 Days Past Due		662
Greater Than 90 Days and Accruing		575
Total Past Due		1,237
Nonaccrual	2,102	3,348
Current	160,764	160,481
Total Non-covered Loans and Leases	162,866	165,066
Commercial Real Estate [Member] | Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due		4,171
Total Past Due		4,171
Nonaccrual	13,110	15,836
Current	61,494	70,066
Total Non-covered Loans and Leases	74,604	90,073
Residential [Member] | Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,851	215
60-89 Days Past Due	597	965
Greater Than 90 Days and Accruing	2,380	4,343
Total Past Due	5,828	5,523
Current	339,935	310,404
Total Non-covered Loans and Leases	345,763	315,927
Residential [Member] | Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	754	492
60-89 Days Past Due	361	191
Greater Than 90 Days and Accruing	853	2,648
Total Past Due	1,968	3,331
Current	262,694	268,861
Total Non-covered Loans and Leases	264,662	272,192
Residential [Member] | Consumer & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	242	67
60-89 Days Past Due	9	16
Greater Than 90 Days and Accruing	483	679
Total Past Due	734	762
Current	36,348	38,098
Total Non-covered Loans and Leases	$ 37,082	$ 38,860