Loans and Allowance for Loan Losses (Details 8) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Summary of loans modified as TDRs
Total TDRs	$ 150,355
Covered Loans [Member]
Summary of loans modified as TDRs
Current	954,689	[1]	1,230,940	[2]
Delinquent	336,787	[1]	457,209	[2]
Total TDRs	77,419
Covered Loans [Member] | Commercial and Industrial [Member]
Summary of loans modified as TDRs
Total TDRs	9,163
Covered Loans [Member] | Commercial Real Estate [Member]
Summary of loans modified as TDRs
Total TDRs	64,108
Covered Loans [Member] | Construction [Member]
Summary of loans modified as TDRs
Total TDRs	4,148
Noncovered Consumer Loans [Member]
Summary of loans modified as TDRs
Total TDRs	57,934
Noncovered Consumer Loans [Member] | Consumer Installment [Member]
Summary of loans modified as TDRs
Total TDRs	33,571
Noncovered Consumer Loans [Member] | Consumer Home Equity Lines [Member]
Summary of loans modified as TDRs
Total TDRs	4,763
Noncovered Consumer Loans [Member] | Credit Card [Member]
Summary of loans modified as TDRs
Total TDRs	2,202
Noncovered Consumer Loans [Member] | Consumer Residential Mortgages [Member]
Summary of loans modified as TDRs
Total TDRs	17,398
Noncovered Loans [Member]
Summary of loans modified as TDRs
Total TDRs	15,002
Total Allowance	107,699		114,690
Noncovered Loans [Member] | Commercial and Industrial [Member]
Summary of loans modified as TDRs
Total TDRs	2,512
Noncovered Loans [Member] | Commercial Real Estate [Member]
Summary of loans modified as TDRs
Total TDRs	9,167
Noncovered Loans [Member] | Construction [Member]
Summary of loans modified as TDRs
Total TDRs	3,323
Accruing TDRs [Member]
Summary of loans modified as TDRs
Current	73,009
Delinquent	5,716
Total TDRs	78,725
Accruing TDRs [Member] | Covered Loans [Member]
Summary of loans modified as TDRs
Current	15,203
Delinquent	2,362
Total TDRs	17,565
Accruing TDRs [Member] | Covered Loans [Member] | Commercial and Industrial [Member]
Summary of loans modified as TDRs
Current	0
Delinquent	0
Total TDRs	0
Accruing TDRs [Member] | Covered Loans [Member] | Commercial Real Estate [Member]
Summary of loans modified as TDRs
Current	15,203
Delinquent	2,362
Total TDRs	17,565
Accruing TDRs [Member] | Covered Loans [Member] | Construction [Member]
Summary of loans modified as TDRs
Current	0
Delinquent	0
Total TDRs	0
Accruing TDRs [Member] | Noncovered Consumer Loans [Member]
Summary of loans modified as TDRs
Current	51,628
Delinquent	2,841
Total TDRs	54,469
Accruing TDRs [Member] | Noncovered Consumer Loans [Member] | Consumer Installment [Member]
Summary of loans modified as TDRs
Current	31,635
Delinquent	1,802
Total TDRs	33,437
Accruing TDRs [Member] | Noncovered Consumer Loans [Member] | Consumer Home Equity Lines [Member]
Summary of loans modified as TDRs
Current	4,226
Delinquent	222
Total TDRs	4,448
Accruing TDRs [Member] | Noncovered Consumer Loans [Member] | Credit Card [Member]
Summary of loans modified as TDRs
Current	2,073
Delinquent	110
Total TDRs	2,183
Accruing TDRs [Member] | Noncovered Consumer Loans [Member] | Consumer Residential Mortgages [Member]
Summary of loans modified as TDRs
Current	13,694
Delinquent	707
Total TDRs	14,401
Accruing TDRs [Member] | Noncovered Loans [Member]
Summary of loans modified as TDRs
Current	6,178
Delinquent	513
Total TDRs	6,691
Accruing TDRs [Member] | Noncovered Loans [Member] | Commercial and Industrial [Member]
Summary of loans modified as TDRs
Current	91
Delinquent	0
Total TDRs	91
Accruing TDRs [Member] | Noncovered Loans [Member] | Commercial Real Estate [Member]
Summary of loans modified as TDRs
Current	3,305
Delinquent	513
Total TDRs	3,818
Accruing TDRs [Member] | Noncovered Loans [Member] | Construction [Member]
Summary of loans modified as TDRs
Current	2,782
Delinquent	0
Total TDRs	2,782
Nonaccruing TDRs [Member]
Summary of loans modified as TDRs
Current	32,512
Delinquent	39,118
Total TDRs	71,630
Nonaccruing TDRs [Member] | Covered Loans [Member]
Summary of loans modified as TDRs
Current	26,907
Delinquent	32,947
Total TDRs	59,854
Nonaccruing TDRs [Member] | Covered Loans [Member] | Commercial and Industrial [Member]
Summary of loans modified as TDRs
Current	1,022
Delinquent	8,141
Total TDRs	9,163
Nonaccruing TDRs [Member] | Covered Loans [Member] | Commercial Real Estate [Member]
Summary of loans modified as TDRs
Current	25,885
Delinquent	20,658
Total TDRs	46,543
Nonaccruing TDRs [Member] | Covered Loans [Member] | Construction [Member]
Summary of loans modified as TDRs
Current	0
Delinquent	4,148
Total TDRs	4,148
Nonaccruing TDRs [Member] | Noncovered Consumer Loans [Member]
Summary of loans modified as TDRs
Current	1,711
Delinquent	1,754
Total TDRs	3,465
Nonaccruing TDRs [Member] | Noncovered Consumer Loans [Member] | Consumer Installment [Member]
Summary of loans modified as TDRs
Current	0
Delinquent	134
Total TDRs	134
Nonaccruing TDRs [Member] | Noncovered Consumer Loans [Member] | Consumer Home Equity Lines [Member]
Summary of loans modified as TDRs
Current	76
Delinquent	239
Total TDRs	315
Nonaccruing TDRs [Member] | Noncovered Consumer Loans [Member] | Credit Card [Member]
Summary of loans modified as TDRs
Current	0
Delinquent	19
Total TDRs	19
Nonaccruing TDRs [Member] | Noncovered Consumer Loans [Member] | Consumer Residential Mortgages [Member]
Summary of loans modified as TDRs
Current	1,635
Delinquent	1,362
Total TDRs	2,997
Nonaccruing TDRs [Member] | Noncovered Loans [Member]
Summary of loans modified as TDRs
Current	3,894
Delinquent	4,417
Total TDRs	8,311
Nonaccruing TDRs [Member] | Noncovered Loans [Member] | Commercial and Industrial [Member]
Summary of loans modified as TDRs
Current	0
Delinquent	2,421
Total TDRs	2,421
Nonaccruing TDRs [Member] | Noncovered Loans [Member] | Commercial Real Estate [Member]
Summary of loans modified as TDRs
Current	3,590
Delinquent	1,759
Total TDRs	5,349
Nonaccruing TDRs [Member] | Noncovered Loans [Member] | Construction [Member]
Summary of loans modified as TDRs
Current	304
Delinquent	237
Total TDRs	541
Total Tdr Allowance [Member]
Summary of loans modified as TDRs
Total Allowance	12,114
Total Tdr Allowance [Member] | Covered Loans [Member]
Summary of loans modified as TDRs
Total Allowance	8,647
Total Tdr Allowance [Member] | Covered Loans [Member] | Commercial and Industrial [Member]
Summary of loans modified as TDRs
Total Allowance	1,578
Total Tdr Allowance [Member] | Covered Loans [Member] | Commercial Real Estate [Member]
Summary of loans modified as TDRs
Total Allowance	7,069
Total Tdr Allowance [Member] | Covered Loans [Member] | Construction [Member]
Summary of loans modified as TDRs
Total Allowance	0
Total Tdr Allowance [Member] | Noncovered Consumer Loans [Member]
Summary of loans modified as TDRs
Total Allowance	2,885
Total Tdr Allowance [Member] | Noncovered Consumer Loans [Member] | Consumer Installment [Member]
Summary of loans modified as TDRs
Total Allowance	1,382
Total Tdr Allowance [Member] | Noncovered Consumer Loans [Member] | Consumer Home Equity Lines [Member]
Summary of loans modified as TDRs
Total Allowance	31
Total Tdr Allowance [Member] | Noncovered Consumer Loans [Member] | Credit Card [Member]
Summary of loans modified as TDRs
Total Allowance	108
Total Tdr Allowance [Member] | Noncovered Consumer Loans [Member] | Consumer Residential Mortgages [Member]
Summary of loans modified as TDRs
Total Allowance	1,364
Total Tdr Allowance [Member] | Noncovered Loans [Member]
Summary of loans modified as TDRs
Total Allowance	582
Total Tdr Allowance [Member] | Noncovered Loans [Member] | Commercial and Industrial [Member]
Summary of loans modified as TDRs
Total Allowance	247
Total Tdr Allowance [Member] | Noncovered Loans [Member] | Commercial Real Estate [Member]
Summary of loans modified as TDRs
Total Allowance	236
Total Tdr Allowance [Member] | Noncovered Loans [Member] | Construction [Member]
Summary of loans modified as TDRs
Total Allowance	$ 99

[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.