Allowance for Non-Covered Loan Loss and Credit Quality (Activity in the Non-Covered Allowance for Loan and Lease Losses) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Balance, beginning of period, Allowance	$ 97,833	$ 110,784	$ 101,921	$ 107,657
Charge-offs	(18,611)	(31,554)	(39,486)	(71,313)
Recoveries	3,114	4,917	4,871	5,697
Provision	15,459	29,767	30,489	71,873
Balance, end of period, Allowance	97,795	113,914	97,795	113,914
Collectively evaluated for impairment, Allowance	92,134	106,590	92,134	106,590
Individually evaluated for impairment, Allowance	5,661	7,324	5,661	7,324
Collectively evaluated for impairment, Non-covered loans and leases	5,550,676	5,486,508	5,550,676	5,486,508
Individually evaluated for impairment, Non-covered loans and leases	196,563	251,170	196,563	251,170
Ending balance, Non-covered loans and leases	5,747,239	5,737,678	5,747,239	5,737,678
Deferred loan fees	11,686		11,686		11,031
Commercial [Member]
Balance, beginning of period, Allowance	20,798	20,890	22,146	24,583
Charge-offs	(3,179)	(9,961)	(11,355)	(32,865)
Recoveries	695	370	1,091	649
Provision	5,436	8,548	11,868	27,480
Balance, end of period, Allowance	23,750	19,847	23,750	19,847
Collectively evaluated for impairment, Allowance	20,812	19,836	20,812	19,836
Individually evaluated for impairment, Allowance	2,938	11	2,938	11
Collectively evaluated for impairment, Non-covered loans and leases	1,330,749	1,203,558	1,330,749	1,203,558
Individually evaluated for impairment, Non-covered loans and leases	29,921	52,295	29,921	52,295
Ending balance, Non-covered loans and leases	1,360,670	1,255,853	1,360,670	1,255,853
Consumer & Other [Member]
Balance, beginning of period, Allowance	856	863	803	455
Charge-offs	(354)	(787)	(888)	(1,076)
Recoveries	111	185	206	282
Provision	255	587	747	1,187
Balance, end of period, Allowance	868	848	868	848
Collectively evaluated for impairment, Allowance	868	848	868	848
Collectively evaluated for impairment, Non-covered loans and leases	34,584	34,215	34,584	34,215
Ending balance, Non-covered loans and leases	34,584	34,215	34,584	34,215
Commercial Real Estate [Member]
Balance, beginning of period, Allowance	63,528	70,460	64,405	67,281
Charge-offs	(12,883)	(19,605)	(24,314)	(35,535)
Recoveries	2,208	4,312	3,453	4,596
Provision	9,129	13,048	18,438	31,873
Balance, end of period, Allowance	61,982	68,215	61,982	68,215
Collectively evaluated for impairment, Allowance	59,277	61,127	59,277	61,127
Individually evaluated for impairment, Allowance	2,705	7,088	2,705	7,088
Collectively evaluated for impairment, Non-covered loans and leases	3,663,034	3,783,102	3,663,034	3,783,102
Individually evaluated for impairment, Non-covered loans and leases	166,464	194,373	166,464	194,373
Ending balance, Non-covered loans and leases	3,829,498	3,977,475	3,829,498	3,977,475
Residential [Member]
Balance, beginning of period, Allowance	5,626	8,235	5,926	5,811
Charge-offs	(2,195)	(1,201)	(2,929)	(1,837)
Recoveries	100	50	121	170
Provision	1,623	2,689	2,036	5,629
Balance, end of period, Allowance	5,154	9,773	5,154	9,773
Collectively evaluated for impairment, Allowance	5,136	9,548	5,136	9,548
Individually evaluated for impairment, Allowance	18	225	18	225
Collectively evaluated for impairment, Non-covered loans and leases	522,309	465,633	522,309	465,633
Individually evaluated for impairment, Non-covered loans and leases	178	4,502	178	4,502
Ending balance, Non-covered loans and leases	522,487	470,135	522,487	470,135
Unallocated [Member]
Balance, beginning of period, Allowance	7,025	10,336	8,641	9,527
Provision	(984)	4,895	(2,600)	5,704
Balance, end of period, Allowance	6,041	15,231	6,041	15,231
Collectively evaluated for impairment, Allowance	$ 6,041	$ 15,231	$ 6,041	$ 15,231