Employee Benefits And Deferred Compensation Plans (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Cash contributed to pension plan		$ 140	$ 165	$ 110
Cash surrender value of bank-owned life insurance contracts		$ 21,534	$ 20,978
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets		6.50%	7.50%	7.50%
Cash contributed to pension plan		$ 140
Company contribution in the next fiscal year		$ 140
Discount rate for projected benefit obligation		3.95%	4.17%	3.83%
Benefit obligation		$ 5,524	$ 5,384	$ 5,437
Supplemental Executive Retirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Amounts to be amortized from accumulated other comprehensive loss into net periodic cost for prior service costs		31
Amounts to be amortized from accumulated other comprehensive loss into net periodic cost for actuarial losses		$ 81
Discount rate for projected benefit obligation		3.30%	3.38%	3.30%
Required benefit service period		10 years
Number of highest consecutive years		5 years
Number of SERP plans | item		2
Benefit obligation		$ 4,255	$ 4,349	$ 4,555
Supplemental Executive Retirement Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Required benefit service period		15 years
Percentage of participants salary used to determine accrued benefit		25.00%
Supplemental Executive Retirement Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Required benefit service period		20 years
Percentage of participants salary used to determine accrued benefit		35.00%
Non-Qualified Executive Insentive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Compensation cost		$ 110	105	210
Benefit obligation		2,200	2,200
401(K) Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Compensation cost		$ 727	$ 751	$ 719
Vesting period of employer contributions		6 years
Forecast [Member] | Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Amounts to be amortized from accumulated other comprehensive loss into net periodic cost for actuarial losses	$ 92
Equity Securities [Member] | Pension Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets		5.00%
Equity Securities [Member] | Pension Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets		10.00%
Equity Securities [Member] | Normal Market Conditions [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets		65.00%
Fixed Income Securities [Member] | Pension Plans [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets		5.00%
Fixed Income Securities [Member] | Pension Plans [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets		6.00%
Fixed Income Securities [Member] | Normal Market Conditions [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets		35.00%