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Loans And Related Allowances For Loan Losses (Modification of Troubled Debt Restructuring by Class) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 USD ($) contract	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of Contracts			10,468
Temporary Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		1	1	1
Recorded Investment | $		$ 149	$ 46	$ 149
Temporary Rate Modification [Member] | Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		1	1	1
Recorded Investment | $		$ 149	$ 46	$ 149
Extension Of Maturity [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2		4
Recorded Investment | $	$ 440		$ 887
Extension Of Maturity [Member] | Acquisition and development- All other A&D [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1		2
Recorded Investment | $	$ 213		$ 430
Extension Of Maturity [Member] | Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1		2
Recorded Investment | $	$ 227		$ 457
Modification Of Payment And Other Terms [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1		4	2
Recorded Investment | $	$ 111		$ 2,582	$ 470
Modification Of Payment And Other Terms [Member] | Commercial real estate- all other CRE [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			1
Recorded Investment | $			$ 2,226
Modification Of Payment And Other Terms [Member] | Acquisition and development- All other A&D [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts				1
Recorded Investment | $				$ 227
Modification Of Payment And Other Terms [Member] | Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	1		3	1
Recorded Investment | $	$ 111		$ 356	$ 243

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+ References

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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