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Employee and Director Benefit Programs (Details) - USD ($) | 12 Months Ended
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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

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