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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, 2022
Dec. 31, 2021
Employee Benefit Plans [Abstract]    
Maximum period of eligible service 30 years  
Change in Benefit Obligation [Abstract]    
Pension benefit obligation, beginning of year $ 51,530 $ 54,106
Service cost 1,025 1,086
Interest cost 1,336 1,209
Actuarial gain (13,431) (3,045)
Benefit payments (1,743) (1,826)
Pension benefit obligation, end of year 38,717 51,530
Change in Plan Assets [Abstract]    
Fair value of plan assets, beginning of year 65,584 56,315
Actual return on plan assets (10,334) 8,795
Employer contributions 2,300 2,300
Benefits paid (1,743) (1,826)
Fair value of plan assets, end of year 55,807 65,584
Funded status of plans at end of year $ 17,090 $ 14,054
Change in discount rate 2.35% 0.35%
Threshold for amortization of gains and losses 10.00%  
Changes in Plan Assets and Benefit Obligations Recognized in Regulatory Assets [Abstract]    
Net gain (loss) arising during the year $ 1,121 $ (8,189)
Recognized net actuarial loss 0 (483)
Recognized prior service credit 13 13
Total changes in regulatory asset during the year 1,134 (8,659)
Amounts Recognized in Regulatory Assets that Have Not Yet Been Recognized as Components of Net Periodic Benefit Cost [Abstract]    
Net loss 2,946 1,825
Prior service credit (37) (50)
Regulatory asset $ 2,909 $ 1,775