Allowance For Loan Losses (Schedule Of Aging Analysis Of Accruing And Non-Accruing Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 2,852,588	$ 2,836,419
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due	619	506
Non-accrual	15,814	16,948
Gross loans	2,877,117	2,862,534
Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,387,649	1,373,604
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due	0	0
Non-accrual	2,977	2,918
Gross loans	1,395,670	1,383,133
Home equity - junior lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	141,947	146,493
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due	0	0
Non-accrual	152	136
Gross loans	142,694	147,036
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	162,239	162,435
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due	0	0
Non-accrual	2,967	2,745
Gross loans	165,549	165,340
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,123,769	1,114,953
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due	619	506
Non-accrual	9,718	11,149
Gross loans	1,135,625	1,127,581
Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	34,672	35,886
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due	0	0
Non-accrual	0	0
Gross loans	34,754	36,083
Demand Deposit Account Overdrafts [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,312	3,048
Financing Receivable, Acquired with Deteriorated Credit Quality, Recorded Investment, Past Due	0	0
Non-accrual	0	0
Gross loans	2,825	3,361
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	6,327	6,946
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	4,330	5,261
Financing Receivables, 30 to 59 Days Past Due [Member] | Home equity - junior lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	535	318
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	145	141
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,094	762
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	51	154
Financing Receivables, 30 to 59 Days Past Due [Member] | Demand Deposit Account Overdrafts [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	172	310
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,544	1,220
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	553	932
Financing Receivables, 60 to 89 Days Past Due [Member] | Home equity - junior lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	41	65
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	198	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	380	211
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	31	9
Financing Receivables, 60 to 89 Days Past Due [Member] | Demand Deposit Account Overdrafts [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	341	3
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	225	495
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	161	418
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home equity - junior lien [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	19	24
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	19
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	45	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	34
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Demand Deposit Account Overdrafts [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 0	$ 0