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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial data (unaudited)
          Net           Earnings Per Share  
(Dollars in thousands, except per share data)   Interest     Interest     Net           Fully  
    Income     Income     Income     Basic     Diluted  
2018                              
First Quarter   $ 5,722     $ 5,330     $ 1,658     $ 0.46     $ 0.46  
Second Quarter     6,141       5,595       1,833       0.51       0.51  
Third Quarter     6,212       5,522       2,014       0.55       0.55  
Fourth Quarter     6,450       5,617       1,828       0.51       0.50  
                                         
2017                                        
First Quarter   $ 5,161     $ 4,855     $ 1,446     $ 0.40     $ 0.40  
Second Quarter     5,425       5,077       1,635       0.45       0.45  
Third Quarter     5,624       5,238       1,720       0.48       0.48  
Fourth Quarter     5,831       5,393       1,367       0.37       0.37