Allowance For Loan Losses And Credit Quality (Schedule Of Allowance For Loan Losses For Covered And Non-Covered Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	$ 136,100	$ 55,768	$ 40,872
Provision for loan losses before benefit attributable to FDIC loss share agreements	82,988	107,373	45,370
Benefit attributable to FDIC loss share agreements	(57,121)	(64,922)
Provision charged to operations	25,867	42,451	45,370
Provision recorded through FDIC loss share receivable	57,121	64,922	147
Transfer of balance to OREO	(17,143)
Loans charged-off	(16,159)	(33,858)	(33,267)
Recoveries	7,975	6,817	2,646
Allowance for loan losses, end of year	193,761	136,100	55,768
Covered Loans [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	73,640	145
Provision for loan losses before benefit attributable to FDIC loss share agreements	63,014	73,819
Benefit attributable to FDIC loss share agreements	(57,121)	(64,922)
Provision charged to operations	5,893	8,897
Provision recorded through FDIC loss share receivable	57,121	64,922	147
Transfer of balance to OREO	(17,143)
Loans charged-off	(1,137)	(325)	(2)
Recoveries	526	1
Allowance for loan losses, end of year	118,900	73,640	145
Non-Covered Loans [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of year	62,460	55,623	40,872
Provision for loan losses before benefit attributable to FDIC loss share agreements	19,974	33,554	45,370
Provision charged to operations	19,974	33,554	45,370
Loans charged-off	(15,022)	(33,533)	(33,265)
Recoveries	7,449	6,816	2,646
Allowance for loan losses, end of year	$ 74,861	$ 62,460	$ 55,623