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Loans And Related Allowances For Loan Losses (Narrative) (Details)		3 Months Ended			6 Months Ended		12 Months Ended
	May 06, 2020 USD ($) contract	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($) contract	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) contract loan	Jun. 30, 2019 USD ($) contract	Dec. 31, 2019 USD ($) contract	Mar. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)
Financing Receivable, Modifications [Line Items]
Allowance for loan losses		$ 17,014,000	$ 11,976,000	$ 11,548,000	$ 17,014,000	$ 11,976,000	$ 12,537,000	$ 15,012,000	$ 11,047,000
Nonaccrual loans		11,081,000	2,300,000		$ 11,081,000	$ 2,300,000	10,849,000
Percentage of loan portfolio accruing loans past due 30 days or more					0.19%	0.46%
Financing receivable, modifications, number of contracts | contract					10,811	2
Financing receivable, modifications, recorded investment		1,042,514,000	$ 470,000		$ 1,042,514,000	$ 470,000
Substandard [Member]
Financing Receivable, Modifications [Line Items]
Increase in non-accrual status					$ 14,400,000
Number of well collateralized loans that increased balance of substandard category | loan					2
COVID-19 [Member]
Financing Receivable, Modifications [Line Items]
PPP loans		144,400,000			$ 144,400,000
Percentage of loan portfolio accruing loans including PPP loans past due 30 days or more					0.17%
Financing receivable, modifications, number of contracts | contract	508
Financing receivable, modifications, recorded investment	$ 161,225,000
CARES Act [Member] | COVID-19 [Member]
Financing Receivable, Modifications [Line Items]
PPP loans SBA guarantee percent					100.00%
Partial Charge Off [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans		$ 200,000			$ 200,000		$ 200,000
New TDRs [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract		0	0		0
Existing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract		6	0		6		15
Financing receivable, modifications, subsequent default, recorded investment		$ 0	$ 0		$ 0
Existing TDRs loans Remodified After Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract					14
Financing receivable, modifications, recorded investment		4,000,000.0			$ 4,000,000.0		$ 4,200,000
Foreclosure 1-4 Family Real Estate Properties [Member]
Financing Receivable, Modifications [Line Items]
Loans secured by real estate properties in process of foreclosure		200,000			200,000		100,000
Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans		17,000			17,000		33,000
Commercial real estate- all other CRE [Member]
Financing Receivable, Modifications [Line Items]
Increase in non-accrual status					200,000
Nonaccrual loans		956,000			$ 956,000		647,000
Number of loan resulted in increase in non-accrual balances | loan					1
Acquisition and development- All other A&D [Member]
Financing Receivable, Modifications [Line Items]
Increase in non-accrual status				8,200,000
Nonaccrual loans		8,439,000			$ 8,439,000		8,058,000
Financing receivable, modifications, number of contracts | contract						1
Financing receivable, modifications, recorded investment			227,000			$ 227,000
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Allowance for loan losses		1,997,000	1,147,000	1,125,000	1,997,000	$ 1,147,000	1,341,000	1,682,000	1,187,000
Nonaccrual loans		18,000			18,000		30,000
Commercial and industrial [Member] | CARES Act [Member] | COVID-19 [Member]
Financing Receivable, Modifications [Line Items]
PPP loans		144,400,000			$ 144,400,000
PPP loans SBA guarantee percent					100.00%
Allowance for loan losses		0			$ 0
Residential mortgage- term [Member]
Financing Receivable, Modifications [Line Items]
Increase in non-accrual status					1,500,000
Nonaccrual loans		1,190,000			$ 1,190,000		1,219,000
Number of loan resulted in increase in non-accrual balances | loan					1
Financing receivable, modifications, number of contracts | contract						1
Financing receivable, modifications, recorded investment			243,000			$ 243,000
Residential mortgage- home equity [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans		427,000			$ 427,000		858,000
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Allowance for loan losses		386,000	$ 319,000	$ 313,000	386,000	$ 319,000	312,000	$ 365,000	$ 315,000
Nonaccrual loans		$ 34,000			$ 34,000		$ 4,000

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