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10. Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Future minimum rental payments for operating leases
(Dollars in thousands)   
    
Year ending December 31,   
 2019   $820 
 2020    809 
 2021    793 
 2022    501 
 2023    393 
 Thereafter    1,624 
 Total minimum obligation   $4,940 
Financial instruments with credit risk
(Dollars in thousands)      
     Contractual Amount 
    2018    2017 
Financial instruments whose contract amount represent credit risk:          
           
Commitments to extend credit  $268,708    233,972 
           
Standby letters of credit and financial guarantees written  $3,651    3,325