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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial data (unaudited)

          Net           Earnings Per Share  
(Dollars in thousands)   Interest     Interest     Net           Fully  
    Income     Income     Income     Basic     Diluted  
2016                              
First Quarter   $ 4,921     $ 4,680     $ 1,274     $ 0.39     $ 0.39  
Second Quarter     5,037       4,789       1,445       0.43       0.43  
Third Quarter     5,168       4,931       1,683       0.52       0.52  
Fourth Quarter     5,186       4,943       1,688       0.51       0.51  
                                         
2015                                        
First Quarter   $ 4,746     $ 4,490     $ 1,642     $ 0.50     $ 0.50  
Second Quarter     4,832       4,578       1,430       0.44       0.43  
Third Quarter     4,870       4,624       1,449       0.44       0.44  
Fourth Quarter     4,904       4,670       1,222       0.37       0.37