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, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Loans And Allowance For Credit Losses [Abstract]
FDIC Indemnification Asset	$ 41,771		$ 100,906		$ 41,771		$ 100,906		$ 51,297	$ 90,929	$ 117,167	$ 133,810
FDIC Indemnification Asset [Roll Forward]
Amounts filed with the FDIC and collected or in process	5,507	[1]	3,904	[1]	15,267	[1]	15,106	[1]
Net change in asset balance due to reestimation of projected cash flows	$ (15,033)	[2]	$ (20,165)	[2]	$ (64,425)	[2]	$ (48,010)	[2]

[1] 1 The FDIC’s reimbursement process requires that submitted expenses be paid, not just incurred, to qualify for reimbursement.

[2] Negative amounts result from the accretion of loan balances based on increases in cash flow estimates and on prepayments.