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Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]  
Summary of loan transactions with directors and executive officers, including their affiliates
  
 For the years ended December 31, 
(dollars in thousands)2017       2016
Balance, beginning of year                        $14,82512,868
New loans6,8435,103
Less loan payments(6,392)(3,146)
Balance, end of year$15,27614,825