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Retirement Benefit Plans (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2021
Net Periodic Benefit Cost [Line Items] |  |  |
Interest credit under cash balance plan | 0.03 |  |
Employer matching contribution, percentage | 5.00% |  |
Employees' Pension Plan |  |  |
Net Periodic Benefit Cost [Line Items] |  |  |
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account |  |  | 1.02%
Defined benefit plan, increase in benefit payable, percent | 3.00% |  |
Defined benefit plan, benefit obligation, increase (decrease) for plan amendment | $ 351,638 |  |
Defined benefit plan, amortization of service cost | 9 years 8 months 12 days |  |
Service Cost | $ 488,000 | $ 460,000 |
Interest Cost | 367,000 | 340,000 |
Expected Return on Plan Assets | (1,099,000) | (950,000) |
Amortization of Prior Service (Credit) Cost | 19,000 | 20,000 |
Amortization of Net Loss (Gain) | 0 | 0 |
Net Periodic (Benefit) Cost | (225,000) | (130,000) |
Plan Contributions During the Period | 0 | 0 |
Estimated Future Contributions in the Current Fiscal Year | $ 0 |  |
Select Executive Retirement Plan |  |  |
Net Periodic Benefit Cost [Line Items] |  |  |
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account |  |  | 2.72%
Defined benefit plan, amortization of service cost | 12 years 6 months |  |
Defined benefit plan, benefit obligation, period increase (decrease) | $ 122,797 |  |
Service Cost | 147,000 | 118,000 |
Interest Cost | 51,000 | 45,000 |
Expected Return on Plan Assets | 0 | 0 |
Amortization of Prior Service (Credit) Cost | 11,000 | 12,000 |
Amortization of Net Loss (Gain) | 39,000 | 38,000 |
Net Periodic (Benefit) Cost | 248,000 | 213,000 |
Plan Contributions During the Period | 116,000 | 118,000 |
Estimated Future Contributions in the Current Fiscal Year | 348,000 |  |
Post-Retirement Benefit Plans |  |  |
Net Periodic Benefit Cost [Line Items] |  |  |
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account |  |  | 3.08%
Service Cost | 27,000 | 31,000 |
Interest Cost | 64,000 | 67,000 |
Expected Return on Plan Assets | 0 | 0 |
Amortization of Prior Service (Credit) Cost | 27,000 | 27,000 |
Amortization of Net Loss (Gain) | (32,000) | 8,000 |
Net Periodic (Benefit) Cost | 86,000 | 133,000 |
Plan Contributions During the Period | 55,000 | $ 28,000 |
Estimated Future Contributions in the Current Fiscal Year | $ 165,000 |  |
On or Subsequent to January 1, 2003 |  |  |
Net Periodic Benefit Cost [Line Items] |  |  |
Service credits, percent of eligible salaries | 6.00% |  |
Minimum | Prior to January 1, 2003 |  |  |
Net Periodic Benefit Cost [Line Items] |  |  |
Service credits, percent of eligible salaries | 6.00% |  |
Maximum | Prior to January 1, 2003 |  |  |
Net Periodic Benefit Cost [Line Items] |  |  |
Service credits, percent of eligible salaries | 12.00% |  |

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