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Employee Benefit Plans, Changes in Benefit Obligation and Plan Assets (Details) - Defined Benefit Pension Plans Combined [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Employee Benefit Plans [Abstract]    
Maximum period of eligible service 30 years  
Change in Benefit Obligation [Abstract]    
Pension benefit obligation at beginning of year $ 38,717 $ 51,530
Service cost 598 1,025
Interest cost 1,876 1,336
Actuarial loss (gain) 974 (13,431)
Benefit payments (1,967) (1,743)
Pension benefit obligation at end of year 40,198 38,717
Change in Plan Assets [Abstract]    
Fair value of plan assets at beginning of year 55,807 65,584
Actual return on plan assets 8,058 (10,334)
Employer contributions 1,680 2,300
Benefits paid (1,967) (1,743)
Fair value of plan assets at end of year 63,578 55,807
Funded status of plans at end of year $ 23,380 $ 17,090
Change in discount rate (0.25%) 2.35%
Threshold for amortization of gains and losses 10.00%  
Changes in Plan Assets and Benefit Obligations Recognized in Regulatory Assets [Abstract]    
Net loss (gain) arising during the year $ (3,472) $ 1,121
Recognized prior service credit 13 13
Total changes in regulatory asset (liability) during the year (3,459) 1,134
Amounts Recognized in Regulatory Assets that Have Not Yet Been Recognized as Components of Net Periodic Benefit Cost [Abstract]    
Net loss (526) 2,946
Prior service credit (24) (37)
Regulatory asset (liability) $ (550) $ 2,909