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11. Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Financial instruments with credit risk
(Dollars in thousands)            
     Contractual Amount  
     2020      2019  
Financial instruments whose contract amount represent credit risk:            
             
Commitments to extend credit   $ 299,039       276,338  
                 
Standby letters of credit and financial guarantees written   $ 4,745       3,558