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Merger (Narrative) (Details) - USD ($)
 3 Months Ended
Jan. 08, 2018
Mar. 31, 2018
Mar. 31, 2017
Jan. 07, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Goodwill   $ 22,528,000     $ 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%        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 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 18,610,000        
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 $ 70,686,000        
Pro Forma Earnings   2,054,000 $ 1,268,000    
Scottdale Bank and Trust Company [Member] | Excluded Acquisition-related Costs [Member]          
Business Acquisition [Line Items]          
Pro Forma Earnings   $ 1,273,000      
Scottdale Bank and Trust Company [Member] | Acquisition-related Costs [Member]          
Business Acquisition [Line Items]          
Pro Forma Earnings     $ 1,273,000