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Acquisition of The Scottdale Bank and Trust Company (Narrative) (Details) - USD ($)
 12 Months Ended
Jan. 08, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 07, 2018
Business Acquisition [Line Items]          
Goodwill   $ 62,840,000 $ 62,840,000    
Amortization expense   1,430,000 1,224,000 $ 104,000  
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 $ 719,000        
Finite-lived intangible assets, amortization expense, year two 629,000        
Finite-lived intangible assets, amortization expense, year three 539,000        
Finite-lived intangible assets, amortization expense, year four 449,000        
Finite-lived intangible assets, amortization expense, year five 359,000        
Finite lived intangible assets, amortization expense, four years after year five 539,000        
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   $ 808,000 $ 898,000