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Employee and Director Benefit Programs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
12. Employee and Director Benefit Programs      
Benefit obligation at beginning of period $ 4,870,000 $ 4,700  
Service cost 359,000 323,000 $ 299,000
Interest cost 70,000 63,000 58,000
Benefits paid (288,000) (216,000)  
Benefit obligation at end of period $ 5,011,000 $ 4,870,000 $ 4,700