Loans And The Allowance For Loan Losses (Data, At Class Level, Of Credit Quality Indicators Of Certain Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2020		Dec. 31, 2019	Mar. 31, 2019
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 1,244,781		$ 1,224,997	$ 1,183,769
Total Real Estate Loans [Member] | Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	987,401		971,874
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	763,349	[1]	742,884	709,852	[1]
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Corporate Credit Exposure—By Credit Rating, Acceptable Or Better [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	550,495		524,943
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Corporate Credit Exposure—By Credit Rating, Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	178,299		184,657
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Corporate Credit Exposure—By Credit Rating, Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	19,157		24,084
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Corporate Credit Exposure—By Credit Rating, Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	15,398		9,200
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	96,698		97,848
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Construction [Member] | Corporate Credit Exposure—By Credit Rating, Acceptable Or Better [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	73,866		73,646
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Construction [Member] | Corporate Credit Exposure—By Credit Rating, Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	12,493		13,380
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Construction [Member] | Corporate Credit Exposure—By Credit Rating, Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	8,133		8,359
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Construction [Member] | Corporate Credit Exposure—By Credit Rating, Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	2,206		2,463
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	666,651		645,036
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Mortgages [Member] | Corporate Credit Exposure—By Credit Rating, Acceptable Or Better [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	476,629		451,297
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Mortgages [Member] | Corporate Credit Exposure—By Credit Rating, Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	165,806		171,277
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Mortgages [Member] | Corporate Credit Exposure—By Credit Rating, Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	11,024		15,725
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member] | Mortgages [Member] | Corporate Credit Exposure—By Credit Rating, Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	13,192		6,737
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	256,157		251,197
Commercial And Industrial [Member] | Corporate Credit Exposure—By Credit Rating, Acceptable Or Better [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	184,214		165,255
Commercial And Industrial [Member] | Corporate Credit Exposure—By Credit Rating, Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	50,615		68,665
Commercial And Industrial [Member] | Corporate Credit Exposure—By Credit Rating, Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	11,836		7,631
Commercial And Industrial [Member] | Corporate Credit Exposure—By Credit Rating, Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	9,492		$ 9,646
Commercial And Industrial [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total gross loans	$ 256,157			$ 241,509

[1] Includes construction loans