Fair Value Of Financial Instruments (Assets Measured On Non-recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loan	$ 9,958	$ 3,315
Residential Mortgages [Member] | Revolving Home Equity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loan	1,574	1,770
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loan	7,455	558
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgages [Member] | Revolving Home Equity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loan		1,009
Fair Value, Measurements, Nonrecurring [Member] | Residential Mortgages [Member] | Revolving Home Equity [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loan		$ 1,009
Fair Value, Measurements, Nonrecurring [Member] | Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loan	6,100
Fair Value, Measurements, Nonrecurring [Member] | Commercial Mortgages [Member] | Owner-occupied Loan [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loan	$ 6,100