Loans and Allowance for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Legacy Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	$ 34,773		$ 46,701
Days Past Due 60 to 89	12,691		21,087
Days Past Due more than 90	60,449		114,124
Total Past Due	107,913		181,912
Current	7,527,863		6,754,675
Total Loans	7,635,776		6,936,587
More than 90 days Past Due and Accruing	11,373		22,514
Nonaccrual Loans	61,682		104,594
Acquired Loans (Noncovered) [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	67		2,642
Days Past Due 60 to 89	452		17,201
Days Past Due more than 90	1,743		810
Total Past Due	2,262		20,653
Current	110,906		244,848
Total Loans	113,168		265,501
More than 90 days Past Due and Accruing	3		810
Nonaccrual Loans	2,949		93
Covered Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	48,822	[1]	54,047	[2]
Days Past Due 60 to 89	17,989	[1]	26,986	[2]
Days Past Due more than 90	269,976	[1]	376,176	[2]
Total Past Due	336,787	[1]	457,209	[2]
Current	954,689	[1]	1,230,940	[2]
Total Loans	1,291,476	[1]	1,688,149	[2]
Commercial and Industrial [Member] | Legacy Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	1,521		5,280
Days Past Due 60 to 89	940		7,592
Days Past Due more than 90	5,490		12,553
Total Past Due	7,951		25,425
Current	2,740,751		1,960,404
Total Loans	2,748,702		1,985,829
More than 90 days Past Due and Accruing	465		4,692
Nonaccrual Loans	9,266		8,368
Commercial and Industrial [Member] | Acquired Loans (Noncovered) [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	0		1,939
Days Past Due 60 to 89	0		511
Days Past Due more than 90	66		703
Total Past Due	66		3,153
Current	26,708		92,995
Total Loans	26,774		96,148
More than 90 days Past Due and Accruing	0		703
Nonaccrual Loans	69		0
Commercial and Industrial [Member] | Covered Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	7,451	[1]	5,509	[2]
Days Past Due 60 to 89	2,137	[1]	2,911	[2]
Days Past Due more than 90	25,801	[1]	70,588	[2]
Total Past Due	35,389	[1]	79,008	[2]
Current	162,150	[1]	180,186	[2]
Total Loans	197,539	[1]	259,194	[2]
Commercial Real Estate Other Receivable [Member] | Legacy Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	6,187		10,801
Days Past Due 60 to 89	4,819		3,832
Days Past Due more than 90	29,976		58,977
Total Past Due	40,982		73,610
Current	1,951,211		1,953,710
Total Loans	1,992,193		2,027,320
More than 90 days Past Due and Accruing	984		1,908
Nonaccrual Loans	36,025		65,096
Commercial Real Estate Other Receivable [Member] | Acquired Loans (Noncovered) [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	0		493
Days Past Due 60 to 89	452		16,650
Days Past Due more than 90	1,675		38
Total Past Due	2,127		17,181
Current	60,616		123,860
Total Loans	62,743		141,041
More than 90 days Past Due and Accruing	0		38
Nonaccrual Loans	2,880		0
Commercial Real Estate Other Receivable [Member] | Covered Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	20,379	[1]	29,241	[2]
Days Past Due 60 to 89	12,895	[1]	16,761	[2]
Days Past Due more than 90	170,795	[1]	208,820	[2]
Total Past Due	204,069	[1]	254,822	[2]
Current	573,779	[1]	763,393	[2]
Total Loans	777,848	[1]	1,018,215	[2]
Commercial Construction [Member] | Legacy Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	39		1,490
Days Past Due 60 to 89	0		1,777
Days Past Due more than 90	7,837		18,639
Total Past Due	7,876		21,906
Current	269,459		255,253
Total Loans	277,335		277,159
More than 90 days Past Due and Accruing	609		2,795
Nonaccrual Loans	7,575		16,364
Commercial Construction [Member] | Covered Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	4,206	[1]	2,179	[2]
Days Past Due 60 to 89	1,674	[1]	2,458	[2]
Days Past Due more than 90	57,978	[1]	83,969	[2]
Total Past Due	63,858	[1]	88,606	[2]
Current	26,051	[1]	28,564	[2]
Total Loans	89,909	[1]	117,170	[2]
Consumer Installment [Member] | Legacy Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	11,531		14,486
Days Past Due 60 to 89	3,388		4,491
Days Past Due more than 90	5,167		7,059
Total Past Due	20,086		26,036
Current	1,241,059		1,279,307
Total Loans	1,261,145		1,305,343
More than 90 days Past Due and Accruing	4,864		3,236
Nonaccrual Loans	624		3,724
Consumer Installment [Member] | Acquired Loans (Noncovered) [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	0		40
Days Past Due 60 to 89	0		16
Days Past Due more than 90	1		23
Total Past Due	1		79
Current	2,519		3,438
Total Loans	2,520		3,517
More than 90 days Past Due and Accruing	1		23
Nonaccrual Loans	0		0
Consumer Installment [Member] | Covered Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	24	[1]	667	[2]
Days Past Due 60 to 89	25	[1]	493	[2]
Days Past Due more than 90	60	[1]	36	[2]
Total Past Due	109	[1]	1,196	[2]
Current	10,013	[1]	10,327	[2]
Total Loans	10,122	[1]	11,523	[2]
Commercial Leases [Member] | Legacy Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	0		0
Days Past Due 60 to 89	0		0
Days Past Due more than 90			0
Total Past Due	0		0
Current	73,530		63,004
Total Loans	73,530		63,004
More than 90 days Past Due and Accruing	0		0
Nonaccrual Loans	0		0
Commercial Leases [Member] | Acquired Loans (Noncovered) [Member]
Summary of loans by portfolio type
Total Loans	0		0
Commercial Leases [Member] | Covered Loans [Member]
Summary of loans by portfolio type
Total Loans	0
Consumer Home Equity Lines [Member] | Legacy Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	2,627		2,500
Days Past Due 60 to 89	778		755
Days Past Due more than 90	1,241		744
Total Past Due	4,646		3,999
Current	720,045		722,351
Total Loans	724,691		726,350
More than 90 days Past Due and Accruing	796		744
Nonaccrual Loans	1,102		72
Consumer Home Equity Lines [Member] | Acquired Loans (Noncovered) [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	67		105
Days Past Due 60 to 89	0		24
Days Past Due more than 90	1		46
Total Past Due	68		175
Current	19,223		22,853
Total Loans	19,291		23,028
More than 90 days Past Due and Accruing	2		46
Nonaccrual Loans	0		0
Consumer Home Equity Lines [Member] | Covered Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	2,656	[1]	1,476	[2]
Days Past Due 60 to 89	1,094	[1]	738	[2]
Days Past Due more than 90	1,088	[1]	443	[2]
Total Past Due	4,838	[1]	2,657	[2]
Current	136,710	[1]	183,277	[2]
Total Loans	141,548	[1]	185,934	[2]
Credit Card [Member] | Legacy Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	1,090		1,570
Days Past Due 60 to 89	707		975
Days Past Due more than 90	1,019		1,337
Total Past Due	2,816		3,882
Current	143,540		145,624
Total Loans	146,356		149,506
More than 90 days Past Due and Accruing	403		371
Nonaccrual Loans	622		966
Consumer Residential Mortgages [Member] | Legacy Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	11,778		10,574
Days Past Due 60 to 89	2,059		1,665
Days Past Due more than 90	9,719		14,815
Total Past Due	23,556		27,054
Current	388,268		375,022
Total Loans	411,824		402,076
More than 90 days Past Due and Accruing	3,252		8,768
Nonaccrual Loans	6,468		10,004
Consumer Residential Mortgages [Member] | Acquired Loans (Noncovered) [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	0		65
Days Past Due 60 to 89	0		0
Days Past Due more than 90	0		0
Total Past Due	0		65
Current	1,840		1,702
Total Loans	1,840		1,767
More than 90 days Past Due and Accruing	0		0
Nonaccrual Loans	0		93
Consumer Residential Mortgages [Member] | Covered Loans [Member]
Summary of loans by portfolio type
Days Past Due 30 to 59	14,106	[1]	14,975	[2]
Days Past Due 60 to 89	164	[1]	3,625	[2]
Days Past Due more than 90	14,254	[1]	12,320	[2]
Total Past Due	28,524	[1]	30,920	[2]
Current	45,986	[1]	65,193	[2]
Total Loans	$ 74,510	[1]	$ 96,113	[2]

[1] Excludes loss share receivable of $205.7 million as of December 31, 2011.

[2] Excludes loss share receivable of $288.6 million as of December 31, 2010.