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v3.24.1.1.u2

Retirement Benefit Plans (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest credit under cash balance plan | 0.03 |  |  |
Employer matching contribution, percent of match, maximum | 5.00% |  |  |
Defined benefit plan, service cost and interest cost |  |  | $ 3,300,000 |
Defined benefit plan, unamortized net loss |  |  | $ 7,200,000 |
Defined benefit plan, benefit obligation from lump sum payment to total benefit obligation ratio |  |  | 8.06% |
Defined benefit plan, net periodic benefit cost, loss due to settlement |  |  | $ 577,000 |
Employees' Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account |  |  |  | 5.50%
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 |  |  |
Net Periodic Benefit Cost |  |  |  |
Service Cost | $ 466,000 | $ 413,000 |  |
Interest Cost | 525,000 | 530,000 |  |
Expected Return on Plan Assets | (932,000) | (857,000) |  |
Amortization of Prior Service Cost | 33,000 | 16,000 |  |
Amortization of Net Loss (Gain) | 0 | 36,000 |  |
Net Periodic Benefit Cost | 92,000 | 138,000 |  |
Plan Contributions During the Period | 0 | 0 |  |
Estimated Future Contributions in the Current Fiscal Year | $ 0 |  |  |
Select Executive Retirement Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account |  |  |  | 5.76%
Defined benefit plan, amortization of service cost | 12 years 6 months |  |  |
Defined benefit plan, benefit obligation, period increase (decrease) | $ 122,797 |  |  |
Net Periodic Benefit Cost |  |  |  |
Service Cost | 17,000 | 163,000 |  |
Interest Cost | 158,000 | 62,000 |  |
Expected Return on Plan Assets | 0 | 0 |  |
Amortization of Prior Service Cost | 10,000 | 10,000 |  |
Amortization of Net Loss (Gain) | 21,000 | 18,000 |  |
Net Periodic Benefit Cost | 206,000 | 253,000 |  |
Plan Contributions During the Period | 127,000 | 116,000 |  |
Estimated Future Contributions in the Current Fiscal Year | 382,000 |  |  |
Postretirement Benefit Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account |  |  |  | 5.83%
Net Periodic Benefit Cost |  |  |  |
Service Cost | 15,000 | 18,000 |  |
Interest Cost | 81,000 | 87,000 |  |
Expected Return on Plan Assets | 0 | 0 |  |
Amortization of Prior Service Cost | 26,000 | 26,000 |  |
Amortization of Net Loss (Gain) | (87,000) | (79,000) |  |
Net Periodic Benefit Cost | 35,000 | 52,000 |  |
Plan Contributions During the Period | 27,000 | $ 27,000 |  |
Estimated Future Contributions in the Current Fiscal Year | $ 82,000 |  |  |
Prior to January 1, 2003 | Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service credits, percent of eligible salaries | 6.00% |  |  |
Prior to January 1, 2003 | Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service credits, percent of eligible salaries | 12.00% |  |  |
On or Subsequent to January 1, 2003 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service credits, percent of eligible salaries | 6.00% |  |  |

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