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12. Employee and Director Benefit Programs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]      
Benefit obligation at beginning of period $ 4,700 $ 4,566  
Service cost 323 299 $ 362
Interest cost 63 58 70
Benefits paid (216) (223)  
Benefit obligation at end of period $ 4,870 $ 4,700 $ 4,566