Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) segment loan item	Dec. 31, 2015 USD ($) loan
Summary Of Significant Accounting Policies [Line Items]
Number of community offices, providing investment and trust services | item	15
Number of operating segments | segment	1
Collection of the original recorded investment on HTM securities (percentage)	85.00%
Impairment charges on securities	$ 0	$ 0
Restricted stock	$ 5,381	3,447
Accrual of interest general discontinued period, in days	90 days
General charge-off period, in days	120 days
Reserve for unfunded loan commitments	$ 345	188
Partial charge-off of loan amount	$ 311	$ 1,154
Number of TDR loans | loan	5	2
Unrecognized tax positions	$ 0
Age of eligibility for noncontributory defined benefit pension plan	21 years
Defined benefit pension plan requisite service period, in years	1 year
Highest consecutive years of average-compensation (years)	5 years
Defined benefit pension plan, years of service	10 years
Advertising and marketing	$ 707	$ 631
TDR amount	914	142
Pre-modification outstanding recorded investment	942	142
Post-modification outstanding recorded investment	1,073	144
Federal Home Loan Bank Of Pittsburgh [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted stock	4,100	2,300
Commercial Mortgage [Member]
Summary Of Significant Accounting Policies [Line Items]
Real estate loans in process of foreclosure	3,100	0
Consumer Installment Loan [Member]
Summary Of Significant Accounting Policies [Line Items]
Partial charge-off of loan amount	$ 2	$ 2
Number of TDR loans | loan	1	0
TDR amount		$ 40
Consumer: Home Equity [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of TDR loans | loan	1	1
TDR amount	$ 102	$ 102
Nonaccrual Impaired Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of TDR loans | loan	4
TDR amount	$ 812
Residential Mortgage [Member]
Summary Of Significant Accounting Policies [Line Items]
Partial charge-off of loan amount	$ 151
Number of TDR loans | loan	2
Federal Reserve Bank Of Philadelphia [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted stock	$ 1,100	1,100
Atlantic Central Bankers Bank [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted stock	$ 156	$ 106