Loans And The Allowance For Credit Losses (Data, At Class Level, Of Credit Quality Indicators Of Certain Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Allowance for Credit Losses, Charge-offs	$ 51	$ 1,560	$ 156	$ 1,713
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	16,713		16,713
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	48,010		48,010
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	25,897		25,897
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	13,685		13,685
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,798		6,798
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,912		9,912
Financing Receivable, Revolving	101,830		101,830
Total Past Due	222,845		222,845
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	16,411		16,411
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	39,142		39,142
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	23,093		23,093
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	8,863		8,863
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,501		6,501
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	6,997		6,997
Financing Receivable, Revolving	92,631		92,631
Total Past Due	193,638		193,638
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	302		302
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	8,866		8,866
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	2,801		2,801
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	4,803		4,803
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	297		297
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,000		2,000
Financing Receivable, Revolving	5,806		5,806
Total Past Due	24,875		24,875
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2		2
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	3		3
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	19		19
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	915		915
Financing Receivable, Revolving	3,393		3,393
Total Past Due	4,332		4,332
Commercial And Industrial [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Allowance for Credit Losses, Charge-offs	4	1,515	4	1,546
Commercial Real Estate Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	98,073		98,073
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	206,050		206,050
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	184,567		184,567
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	96,338		96,338
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	84,051		84,051
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	288,007		288,007
Total Past Due	957,086		957,086
Commercial Real Estate Mortgages [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	98,073		98,073
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	204,029		204,029
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	172,097		172,097
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	94,617		94,617
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	67,061		67,061
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	274,443		274,443
Total Past Due	910,320		910,320
Commercial Real Estate Mortgages [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,021		2,021
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	401		401
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	1,527		1,527
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	10,077		10,077
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	9,887		9,887
Total Past Due	23,913		23,913
Commercial Real Estate Mortgages [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	12,069		12,069
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	194		194
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	6,913		6,913
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,677		3,677
Total Past Due	22,853		22,853
Commercial Real Estate Mortgages [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Allowance for Credit Losses, Charge-offs
Consumer And Other Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	347		347
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	208		208
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	30		30
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	15		15
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	16		16
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	26		26
Financing Receivable, Revolving	141		141
Total Past Due	783		783
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff			106
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff			18
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff			1
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			1
Financing Receivable, Allowance for Credit Losses, Charge-offs			126
Consumer And Other Loans [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	347		347
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	208		208
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	30		30
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	15		15
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	16		16
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	26		26
Financing Receivable, Revolving	141		141
Total Past Due	783		783
Consumer And Other Loans [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Allowance for Credit Losses, Charge-offs	47	45	126	112
Residential Mortgages [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	26,348		26,348
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	73,693		73,693
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	102,913		102,913
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	70,835		70,835
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	18,318		18,318
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	151,418		151,418
Total Past Due	443,525		443,525
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff			1
Residential Mortgages [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	26,185		26,185
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	73,548		73,548
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	102,523		102,523
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	70,612		70,612
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	18,113		18,113
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	148,244		148,244
Total Past Due	439,225		439,225
Residential Mortgages [Member] | Non-Performing Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	163		163
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	145		145
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	390		390
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	223		223
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	205		205
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	3,174		3,174
Total Past Due	4,300		4,300
Residential Mortgages [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Allowance for Credit Losses, Charge-offs			1	$ 55
Home Equities [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	7,481		7,481
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,955		2,955
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	618		618
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	614		614
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	591		591
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,194		2,194
Financing Receivable, Revolving	65,708		65,708
Total Past Due	80,161		80,161
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff			25
Financing Receivable, Allowance for Credit Losses, Charge-offs			25
Home Equities [Member] | Performing Financial Instruments [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Year One, Originated, Current Fiscal Year	7,481		7,481
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year	2,955		2,955
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year	618		618
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year	614		614
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year	591		591
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2,192		2,192
Financing Receivable, Revolving	65,325		65,325
Total Past Due	79,776		79,776
Home Equities [Member] | Non-Performing Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Originated, More than Five Years before Current Fiscal Year	2		2
Financing Receivable, Revolving	383		383
Total Past Due	385		385
Home Equities [Member] | Total Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Allowance for Credit Losses, Charge-offs			$ 25