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10. Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Rental Payments for Operating Leases
(Dollars in thousands)      
       
Year ending December 31,      
2018   $ 716  
2019     697  
2020     678  
2021     663  
2022     369  
Thereafter     1,739  
Total minimum obligation   $ 4,862  
Financial instruments with credit risk
(Dollars in thousands)            
    Contractual Amount  
    2017     2016  
Financial instruments whose contract amount represent credit risk:            
             
Commitments to extend credit   $ 233,972       195,528  
                 
Standby letters of credit and financial guarantees written   $ 3,325       3,728