Employee Benefit Plans - Changes in Projected Benefit Obligations for SERP (Details) - Supplemental Employee Retirement Plan - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Defined Benefit Change in Benefit Obligation [Roll Forward] | |||
| Benefit obligation at beginning of year | $ 1,923 | $ 2,064 | $ 2,174 |
| Net periodic benefit cost: | |||
| Interest cost | 61 | 61 | 84 |
| Actuarial loss (gain) | 0 | 74 | 82 |
| Total net period cost | 61 | 135 | 166 |
| Benefits paid | (276) | (276) | (276) |
| Benefit obligation at end of year | 1,708 | 1,923 | 2,064 |
| Funded status: | |||
| Accrued liability as of December 31 | $ (1,708) | $ (1,923) | $ (2,064) |
| Discount rate used for benefit obligation | 3.25% | 3.25% | 4.00% |