Loans And Allowance For Credit Losses (Schedule Of Changes In The FDIC Indemnification Asset) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
FDIC Indemnification Asset [Roll Forward]
Balance at beginning of period	$ 121,332		$ 172,170		$ 133,810		$ 195,516
Amounts filed with the FDIC and collected or in process	12,495		(6,404)		11,202		(12,911)
Net change in asset balance due to reestimation of projected cash flows	(16,660)	[1]	(15,209)	[1]	(27,845)	[1]	(32,048)	[1]
Balance at end of period	$ 117,167		$ 150,557		$ 117,167		$ 150,557

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