Loans And Related Allowances For Loan Losses (Modification of Troubled Debt Restructuring by Class) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) contract	Mar. 31, 2019 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	9,068
Recorded Investment | $	$ 1,053,732
Temporary Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment | $
Temporary Rate Modification [Member] | Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment | $
Temporary Rate Modification [Member] | Commercial real estate- all other CRE [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment | $
Temporary Rate Modification [Member] | Acquisition and development- 1-4 family residential construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment | $
Temporary Rate Modification [Member] | All Other Acquisition And Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment | $
Temporary Rate Modification [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment | $
Temporary Rate Modification [Member] | Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment | $
Temporary Rate Modification [Member] | Residential mortgage- home equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment | $
Temporary Rate Modification [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Recorded Investment | $
Extension Of Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Extension Of Maturity [Member] | Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Extension Of Maturity [Member] | Commercial real estate- all other CRE [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Extension Of Maturity [Member] | Acquisition and development- 1-4 family residential construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Extension Of Maturity [Member] | All Other Acquisition And Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Extension Of Maturity [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Extension Of Maturity [Member] | Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Extension Of Maturity [Member] | Residential mortgage- home equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Extension Of Maturity [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Modification Of Payment And Other Terms [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		2
Recorded Investment | $		$ 470
Modification Of Payment And Other Terms [Member] | Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Modification Of Payment And Other Terms [Member] | Commercial real estate- all other CRE [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Modification Of Payment And Other Terms [Member] | Acquisition and development- 1-4 family residential construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Modification Of Payment And Other Terms [Member] | All Other Acquisition And Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		1
Recorded Investment | $		$ 227
Modification Of Payment And Other Terms [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Modification Of Payment And Other Terms [Member] | Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		1
Recorded Investment | $		$ 243
Modification Of Payment And Other Terms [Member] | Residential mortgage- home equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts
Modification Of Payment And Other Terms [Member] | Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts