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Investments (Narrative) (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
security
$ / shares
Dec. 31, 2016
USD ($)
security
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Available-for-sale Securities [Line Items]        
Restricted stock $ 456 $ 1,767    
Number of temporarily impaired securities | security 93 115    
Securities pledged as collateral $ 92,500 $ 79,100    
Gross Unrealized Losses 820 1,574    
Cumulative OTTI Charges 595 595 $ 585 $ 555
Fair value of temporarily impaired securities 51,093 $ 66,604    
Other-than-temporary-impairment charges $ 0      
Federal Home Loan Bank of Pittsburgh [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Restricted stock per share | $ / shares $ 100      
Non-Federal Home Loan Bank Of Pittsburgh [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Restricted stock $ 30      
Municipal Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Number of temporarily impaired securities | security 20 45    
Gross Unrealized Losses $ 193 $ 571    
Fair value of temporarily impaired securities $ 11,384 $ 25,005    
Trust Preferred Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Number of temporarily impaired securities | security 5 7    
Gross Unrealized Gain (Loss) $ (183)      
Gross Unrealized Losses 187 $ 518    
Fair value of temporarily impaired securities $ 4,581 $ 5,461    
Private-Label Mortgage-Backed Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Number of temporarily impaired securities | security 1 1    
Gross Unrealized Gain (Loss) $ 76      
Gross Unrealized Losses 5 $ 5    
Cumulative OTTI Charges 595      
Fair value of temporarily impaired securities $ 245 $ 281