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
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	$ 2,165,285		$ 2,133,120
Net financial impact on interest income	7,671	8,324
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	1,497	1,241
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	2,444	3,075
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity	2,165,285		2,133,120
Net financial impact on interest income	3,730	4,008
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	212	(181)
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(1,709)	(1,060)
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(666)	(416)
Term [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(1,778)	(2,659)
Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(24)	(39)
One Through Four Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(3,601)	(3,860)
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	(105)	(109)
Nonaccruing [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity			1,257
Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Loans and Leases Receivable, Gross, Consumer, Home Equity			1,036
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			221	[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			$ 0	[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.