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Acquisition of The Scottdale Bank and Trust Company (Narrative) (Details) - USD ($)
 12 Months Ended
Jan. 08, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 07, 2018
Business Acquisition [Line Items]          
Goodwill   $ 62,840,000 $ 3,918,000    
Amortization expense   1,224,000 104,000 $ 126,000  
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 19,178,000        
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 $ 808,000        
Finite-lived intangible assets, amortization expense, year two 719,000        
Finite-lived intangible assets, amortization expense, year three 629,000        
Finite-lived intangible assets, amortization expense, year four 539,000        
Finite-lived intangible assets, amortization expense, year five 449,000        
Finite lived intangible assets, amortization expense, four years after year five 898,000        
Fair value of purchased loans $ 70,769,000        
Pro forma earnings   11,736,000 $ 8,075,000    
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   1,304,000      
Income tax nondeductible expenses   205,000      
Scottdale Bank and Trust Company [Member] | Core Deposits [Member]          
Business Acquisition [Line Items]          
Amortization expense   $ 898,000