Allowance For Loan Losses (Schedule of Non-Commercial Loans By Payment Performance) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	$ 3,587,608	$ 3,127,410
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	1,656,989	1,468,278
Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	153,496	139,499
Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	51,190	29,162
DDA Overdrafts
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	6,328	4,411
Non-commercial Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	1,868,003	1,641,350
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	1,863,387	1,638,257
Performing | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	1,652,543	1,465,445
Performing | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	153,334	139,239
Performing | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	51,188	29,162
Performing | DDA Overdrafts
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	6,322	4,411
Non-Performing
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	4,616	3,093
Non-Performing | Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	4,446	2,833
Non-Performing | Home equity
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	162	260
Non-Performing | Consumer Loan
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	2	0
Non-Performing | DDA Overdrafts
Financing Receivable, Recorded Investment [Line Items]
Loans, Total	$ 6	$ 0