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Loans And Related Allowances For Loan Losses (Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) loan	Dec. 31, 2019 USD ($) loan region	Dec. 31, 2018 USD ($) loan
Financing Receivable, Modifications [Line Items]
Commercial amount benchmark minimum for internal annual review		$ 500,000
Commercial amount benchmark minimum for annual review by independent reviewer		1,000,000
Non consumer loan amount benchmark minimum for annual review by independent reviewer		500,000
Nonaccrual loans subject to partial charge off		10,849,000	$ 4,922,000
Commercial relationship amount benchmark for evaluation		750,000
Maximum commercial loan benchmark for external appraisal		$ 500,000
Past appraisal period benchmark for external appraisal		18 months
Threshold limit for commercial loan appraisal by internal discounted appraisal grid		$ 500,000
Financing receivable, modifications, number of contracts | loan		15	16
Financing receivable, modifications, recorded investment		$ 4,200,000	$ 4,900,000
Financing receivable, modifications, subsequent default, recorded investment		$ 0
Pass [Member]
Financing Receivable, Modifications [Line Items]
Number of geographic regions utilized | region		7
Number of geographic regions that represent lending footprint | region		6
Partial Charge Off [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans subject to partial charge off		$ 100,000	300,000
New TDR [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | loan		2
Financing receivable, modifications, recorded investment		$ 200,000
Existing Troubled Debt Restructuring Loans Remodified After Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | loan		2
Troubled Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Unused commitments to extend credit		$ 0	0
Foreclosure 1-4 Family Real Estate Properties [Member]
Financing Receivable, Modifications [Line Items]
Loans secured by real estate properties in process of foreclosure		100,000	300,000
Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans subject to partial charge off		33,000	173,000
Commercial real estate- all other CRE [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans subject to partial charge off		647,000	1,968,000
Acquisition and development- All other A&D [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans subject to partial charge off		8,058,000	147,000
Acquisition and development- All other A&D [Member] | Substandard [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | loan	1
Financing receivable, modifications, recorded investment	$ 8,000,000
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans subject to partial charge off		30,000
Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans subject to partial charge off		1,219,000	1,911,000
Residential mortgage- home equity [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans subject to partial charge off		858,000	713,000
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans subject to partial charge off		$ 4,000	$ 10,000

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