Allowance For Loan Losses, Allowance For Losses On Lending-Related Commitments And Impaired Loans (Summary Of Activity In The Allowance For Covered Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Allowance For Loan Losses, Allowance For Losses On Lending-Related Commitments And Impaired Loans [Abstract]
Balance at beginning of period	$ 12,977
Provision for covered loan losses before benefit attributable to FDIC loss share agreements	11,229	4,844
Benefit attributable to FDIC loss share agreements	(8,983)	(3,876)
Net provision for covered loan losses	2,246	968
Increase in FDIC indemnification asset	8,983	3,876
Loans charged-off	(6,523)
Recoveries of loans charged-off	52
Net charge-offs	(6,471)
Balance at end of period	$ 17,735	$ 4,844