Allowance For Loan Losses And Credit Quality (Schedule Of Allowance For Loan Losses For Covered Loan And Non-Covered Loan Portfolios) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Financing Receivable, Allowance For Credit Losses [Line Items]
Balance, beginning of period	$ 193,761	$ 136,100
Provision for loan losses before benefit attributable to FDIC loss share agreements	3,541	12,255
Benefit attributable to FDIC loss share agreements	(684)	(6,784)
Provision charged to operations	2,857	5,471
Provision recorded through FDIC loss share receivable	684	6,784
Transfer of balance to OREO	(5,363)
Loans charged-off	(15,537)	(3,294)
Recoveries	790	4,058
Balance, end of period	177,192	149,119
Covered Loans [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Balance, beginning of period	118,900	73,640
Provision for loan losses before benefit attributable to FDIC loss share agreements	1,431	8,554
Benefit attributable to FDIC loss share agreements	(684)	(6,784)
Provision charged to operations	747	1,770
Provision recorded through FDIC loss share receivable	684	6,784
Transfer of balance to OREO	(5,357)
Loans charged-off	(13,266)	(218)
Recoveries	17	327
Balance, end of period	101,725	82,303
Non-Covered Loans [Member]
Financing Receivable, Allowance For Credit Losses [Line Items]
Balance, beginning of period	74,861	62,460
Provision for loan losses before benefit attributable to FDIC loss share agreements	2,110	3,701
Provision charged to operations	2,110	3,701
Transfer of balance to OREO	(6)
Loans charged-off	(2,271)	(3,076)
Recoveries	773	3,731
Balance, end of period	$ 75,467	$ 66,816