Loans And Allowance For Credit Losses (Summary Of Net Financial Impact On Interest Income Due To Interest Rate Modifications Below Market For Accruing TDR Loans) (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	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$ 2,124,328		$ 2,124,328		$ 2,177,680
Net financial impact on interest income	7,369	6,611	23,240	18,921
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	1,168	443	3,466	1,169
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	2,371	1,716	8,040	5,211
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,124,328		2,124,328		2,177,680
Net financial impact on interest income	3,830	4,452	11,734	12,541
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(107)	(134)	(308)	(157)
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(1,061)	(309)	(3,158)	(1,012)
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(237)	(273)	(755)	(742)
Term [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(2,134)	(1,443)	(7,285)	(4,469)
Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(24)	(18)	(97)	(51)
One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(3,700)	(4,204)	(11,313)	(12,045)
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(106)	(230)	(324)	(445)
Nonaccruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					4,282
Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					4,008
Nonaccruing [Member] | Interest Rate Below Market [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					0
Nonaccruing [Member] | Maturity Or Term Extension [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					0
Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					131	[1]
Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity					$ 143	[2]

[1] Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.

[2] Includes TDRs that resulted from a combination of any of the previous modification types.