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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
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  
2019                              
First Quarter   $ 6,477     $ 5,496     $ 1,637     $ 0.45     $ 0.45  
Second Quarter     6,554       5,501       1,486       0.41       0.41  
Third Quarter     6,561       5,570       1,021       0.28       0.28  
Fourth Quarter     12,881       11,206       3,027       0.44       0.44  
                                         
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