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11. Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Financial instruments with credit risk
     Contractual Amount 
    2019    2018 
Financial instruments whose contract amount represent credit risk:          
           
Commitments to extend credit  $276,338    268,708 
           
Standby letters of credit and financial guarantees written  $3,558    3,651