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Allowance For Loan Losses (Schedule Of Aging Analysis Of Accruing And Non-Accruing Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 3,559,926	$ 3,106,150
Non-accrual	14,551	10,297
Gross loans	3,587,608	3,127,410
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,642,724	1,458,746
Non-accrual	4,275	2,814
Gross loans	1,656,989	1,468,278
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	152,083	138,480
Non-accrual	138	168
Gross loans	153,496	139,499
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	284,140	206,447
Non-accrual	1,676	1,345
Gross loans	286,314	208,484
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,424,245	1,269,520
Non-accrual	8,461	5,970
Gross loans	1,433,291	1,277,576
Consumer Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	50,894	29,108
Non-accrual	1	0
Gross loans	51,190	29,162
DDA Overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	5,840	3,849
Non-accrual	0	0
Gross loans	6,328	4,411
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	11,451	9,631
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	8,607	5,990
Financing Receivables, 30 to 59 Days Past Due [Member] | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,240	671
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	397	549
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	487	1,841
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	253	39
Financing Receivables, 30 to 59 Days Past Due [Member] | DDA Overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	467	541
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,423	1,070
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,213	709
Financing Receivables, 60 to 89 Days Past Due [Member] | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	11	88
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	49	1
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	94	245
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	41	13
Financing Receivables, 60 to 89 Days Past Due [Member] | DDA Overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	15	14
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	257	262
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	170	19
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	24	92
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	52	142
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	4	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1	2
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | DDA Overdrafts
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 6	$ 7

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