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5. Time Deposits (Tables)
 12 Months Ended
Dec. 31, 2017
Banking and Thrift [Abstract]  
Scheduled maturities of time deposits
(Dollars in thousands)      
       
2018   $ 81,684  
2019     21,064  
2020     13,343  
2021     3,903  
2022 and thereafter     3,107  
         
Total   $ 123,101