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9. Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]  
Summary of activity for related party loans
(Dollars in thousands)      
   2018  2017
Beginning balance  $3,679    4,503 
New loans   8,030    5,879 
Repayments   (8,517)   (6,703)
Ending balance  $3,192    3,679