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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net gain on sales of investment securities   $ 42,000 $ 1,046,000 $ 325,000
Held-to-maturity Securities   101,356,000 0 0
Mortgage banking income   872,000 922,000 456,000
Other securities   217,000 304,000 382,000
Residential real estate held in other real estate owned   42,000 57,000  
Foreclosure proceedings in process   308,000 426,000  
Mortgage servicing rights   126,000 144,000  
Mortgage servicing rights, amortization   18,000 30,000 24,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures   277,000 321,000  
Low Income Housing Tax Credit   $ 46,000 $ 46,000 $ 46,000
Federal tax rate   34.00% 34.00% 34.00%
Reduction in write-down of deferred tax asset   $ 1,169,000    
Core Deposit Intangible, Amortization Period   10 years    
Goodwill, Impairment Loss   $ 0 $ 0 $ 0
Class of warrant or right, outstanding   0 0 0
Scenario Forecast [Member]        
Federal tax rate 21.00%      
Federal Home Loan Bank of Pittsburgh [Member]        
Other securities   $ 114,000 $ 135,000  
Restricted investments   4,384,000 2,443,000  
Reserve for Off-balance Sheet Activities [Member]        
Valuation Allowances and Reserves, Balance   $ 105,000 $ 120,000  
Commercial [Member]        
Loan Terms   1 year    
Loan To Value Ratio   80.00%    
Maximum [Member]        
Maturity of interest bearing time deposits with other financial institutions   1 year    
Non-residential consumer loans charged off on contractual basis in event of bankruptcy, in period   120 days    
Maximum [Member] | Building Assets [Member]        
Property, Plant and Equipment, Useful Life   50 years    
Maximum [Member] | Furniture, Fixtures, and Equipment [Member]        
Property, Plant and Equipment, Useful Life   10 years    
Maximum [Member] | Land Improvements [Member]        
Property, Plant and Equipment, Useful Life   20 years    
Maximum [Member] | Leasehold Improvements [Member]        
Property, Plant and Equipment, Useful Life   30 years    
Maximum [Member] | Home equity lines of credit [Member]        
Loan Terms   20 years    
Loan To Value Ratio   85.00%    
Maximum [Member] | Home Equity Lines Of Credit [Member]        
Loan Terms   5 years    
Maximum [Member] | Residential Portfolio [Member]        
Loan Terms   30 years    
Loan To Value Ratio   100.00%    
Loan To Value Ratio, Exposure After Private Mortgage Insurance   85.00%    
Minimum [Member] | Building Assets [Member]        
Property, Plant and Equipment, Useful Life   5 years    
Minimum [Member] | Furniture, Fixtures, and Equipment [Member]        
Property, Plant and Equipment, Useful Life   3 years    
Minimum [Member] | Land Improvements [Member]        
Property, Plant and Equipment, Useful Life   10 years    
Minimum [Member] | Leasehold Improvements [Member]        
Property, Plant and Equipment, Useful Life   10 years