Loans And Allowance For Credit Losses (Schedule Of Changes In The FDIC Indemnification Asset) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
FDIC Indemnification Asset [Roll Forward]
Balance at beginning of period	$ 117,167		$ 150,557		$ 133,810		$ 195,516
Amounts filed with the FDIC and collected or in process	3,904		1,551		15,106		(11,360)
Net change in asset balance due to reestimation of projected cash flows	(20,165)	[1]	(16,809)	[1]	(48,010)	[1]	(48,857)	[1]
Balance at end of period	$ 100,906		$ 135,299		$ 100,906		$ 135,299

[1] Negative amounts result from the accretion of loan balances based on increases in cash flow estimates on the underlying indemnified loans.