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Summary of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 10 Months Ended 12 Months Ended 36 Months Ended
Jun. 30, 2018
USD ($)
Apartment
Oct. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2018
USD ($)
Jun. 25, 2014
shares
May 06, 2014
shares
Other securities     $ 595,000 $ 217,000 $ 304,000        
Residential real estate held in other real estate owned     844,000 42,000     $ 844,000    
Foreclosure proceedings in process     211,000 308,000     211,000    
Mortgage servicing rights     106,000 126,000     106,000    
Mortgage servicing rights, amortization     20,000 18,000 30,000        
Impairment of mortgage servicing rights             0    
Principal balance of loans serviced     15,601,000 17,963,000     15,601,000    
Total investment in limited partnership     $ 233,000 277,000     233,000    
Low Income Housing Tax Credit       $ 76,000 $ 76,000 $ 76,000      
Number of apartments under the project | Apartment 37                
Limited partner capital contribution commitment $ 7,579,000                
Project investment amortization period 10 years                
Annual LIHTCs mount awarded for the project $ 861,000                
Total anticipated LIHTCs amount under the housing project 8,613,000                
Federal tax rate     21.00% 34.00% 34.00%        
Reduction in write-down of deferred tax asset       $ 1,169,000          
Amortization expense     $ 1,224,000 104,000 $ 126,000        
Goodwill, Impairment Loss   $ 0   0 0        
Liability of funded status     345,000       345,000    
Settlement gains recognized     737,000            
Trust assets     125,567,000 124,354,000     125,567,000    
2014 Restricted Stock Plan [Member]                  
Shares authorized per plan | shares               100,000 100,000
401(k) Plan [Member]                  
Defined contribution plan, associated expense     514,000 383,000 362,000        
First Priority Financial Corp. [Member]                  
Goodwill acquired     39,744,000            
Scottdale Bank and Trust Company [Member]                  
Goodwill acquired     19,178,000            
Phoenix Bancorp Incorporated [Member]                  
Goodwill acquired     3,918,000            
Scottdale and First Priority [Member] | 401(k) Plan [Member]                  
Defined contribution plan, associated expense     $ 0            
Core Deposit Intangible [Member]                  
Core Deposit Intangible, Amortization Period     10 years            
Intangible assets, net     $ 6,893,000 308,000     6,893,000    
Amortization expense     1,188,000 86,000 $ 96,000        
Other Assets [Member]                  
Total investment in limited partnership $ 1,710,000   1,710,000       1,710,000    
Federal Home Loan Bank of Pittsburgh [Member]                  
Other securities     275,000 114,000          
Reserve for Off-balance Sheet Activities [Member]                  
Valuation allowances and reserves, balance     $ 159,000 $ 105,000     $ 159,000    
Commercial [Member]                  
Loan terms     1 year            
Loan to value ratio     80.00%       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     15 years            
Maximum [Member] | Home equity lines of credit [Member]                  
Loan terms     20 years            
Loan to value ratio     85.00%       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%       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