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		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income	[1]	$ (1,623)	$ (2,074)
Commercial Loan [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(497)	(540)
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(282)	(468)
Home Equity Credit Line [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		0	(2)
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(844)	(1,066)
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(297)	(261)
Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(200)	(279)
Construction And Land Development [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(4)	(90)
Term [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(278)	(378)
1-4 Family Residential [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		(825)	(1,037)
Construction And Other Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Net financial impact on interest income		$ (19)	$ (27)

[1] Calculated based on the difference between the modified rate and the premodified rate applied to the recorded investment.