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Acquisition of The Scottdale Bank and Trust Company (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 08, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 07, 2018
Dec. 31, 2017
Business Acquisition [Line Items]              
Goodwill   $ 62,767,000   $ 62,767,000     $ 3,918,000
Scottdale Bank and Trust Company [Member]              
Business Acquisition [Line Items]              
Date of acquisition Jan. 08, 2018            
Per share price $ 34.16         $ 1,166  
Ratio of conversion of acquiree's shares to entity's shares 38.88%            
Common stock shares issued to acquire the company 1,878,827            
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable $ 64,181,000            
Payments to acquire businesses gross 2,792,000            
Business combination consideration transferred 66,973,000            
Goodwill 19,189,000            
Finite-lived Intangible Assets Acquired $ 4,940,000            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years            
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months $ 898,000            
Finite-Lived Intangible Assets, Amortization Expense, Year Two 808,000            
Finite-Lived Intangible Assets, Amortization Expense, Year Three 719,000            
Finite-Lived Intangible Assets, Amortization Expense, Year Four 629,000            
Finite-Lived Intangible Assets, Amortization Expense, Year Five 539,000            
Finite-Lived Intangible Assets, Amortization Expense, after Year Five 1,347,000            
Fair value of purchased loans $ 70,769,000            
Pro Forma Earnings   $ 2,196,000 $ 2,424,000 7,109,000 $ 6,150,000    
Severance and retention bonus expenses       518,000      
Scottdale Bank and Trust Company [Member] | Excluded Acquisition-related Costs [Member]              
Business Acquisition [Line Items]              
Pro Forma Earnings       $ 1,294,000