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Other Liabilities (Narrative) (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 21 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 29, 2014 | Feb. 28, 2018 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2020
Other Liabilities [Line Items] |  |  |  |  |  |  |  |
Accrued pension liability | $ 7,500,000 |  | $ 3,718,000 |  | $ 3,718,000 |  | $ 3,718,000 | $ 4,048,000
Service cost |  |  |  |  | 0 | $ 0 | $ 0 |
Interest cost |  |  | 59,000 | $ 65,000 | 182,000 | 199,000 |  |
Actuarial loss (gain) |  |  | $ 52,000 | $ 52,000 | $ 156,000 | $ 155,000 |  |
Discount rate |  |  | 4.25% |  | 4.25% |  | 4.25% |
Discount term |  |  |  |  | 15 years |  |  |
Monthly estate payment amount |  |  | $ 57,000 |  | $ 57,000 |  | $ 57,000 |
Discounted value |  |  | 2,700,000 |  | 2,700,000 |  | 2,700,000 |
Accumulated prior service cost |  |  | 3,100,000 |  | $ 3,100,000 |  | 3,100,000 |
Accumulated prior service cost amortization period |  |  |  |  | 15 years |  |  |
Accrued pension costs included in other liabilities |  |  | $ 4,400,000 |  | $ 4,400,000 |  | $ 4,400,000 |
Payment related to annuity |  | $ 2,400,000 |  |  |  |  |  |
Payment period |  |  |  |  | 42 months |  |  |
Benefit obligation, gross | 10,200,000 |  |  |  | $ 10,200,000 |  |  |
Supplemental Executive Retirement Plans [Member] |  |  |  |  |  |  |  |
Other Liabilities [Line Items] |  |  |  |  |  |  |  |
Accrued pension liability | $ 7,600,000 |  |  |  |  |  |  |

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