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Employee Benefit Plans - Changes in Projected Benefit Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Change in benefit obligation:      
Actuarial loss (gain) $ 774 $ (32,400)  
DB Pension Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 70,521 93,009  
Service cost 0 0 $ 0
Interest cost 3,275 1,985 1,628
Plan participants’ contributions 0 0  
Actuarial loss (gain) 1,242 (20,729)  
Benefits paid (4,320) (3,744)  
Benefit obligation at end of year 70,718 70,521 93,009
Change in plan assets:      
Fair value of plan assets at beginning of year 78,885 96,393  
Actual return on plan assets 10,079 (13,764)  
Plan participants’ contributions 0 0  
Employer contributions 0 0  
Benefits paid (4,320) (3,744)  
Fair value of plan assets at end of year 84,644 78,885 96,393
Funded (unfunded) status 13,926 8,364  
Life and Healthcare Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 7,603 10,055  
Service cost 33 174 186
Interest cost 354 223 180
Plan participants’ contributions 92 100  
Actuarial loss (gain) (153) (2,598)  
Benefits paid (326) (351)  
Benefit obligation at end of year 7,603 7,603 10,055
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Plan participants’ contributions 92 100  
Employer contributions 234 251  
Benefits paid (326) (351)  
Fair value of plan assets at end of year 0 0 0
Funded (unfunded) status (7,603) (7,603)  
SERP Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 24,991 34,033  
Service cost 43 78 231
Interest cost 1,148 814 692
Plan participants’ contributions 0 0  
Actuarial loss (gain) (315) (9,083)  
Benefits paid (906) (851)  
Benefit obligation at end of year 24,961 24,991 34,033
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Plan participants’ contributions 0 0  
Employer contributions 906 850  
Benefits paid (906) (850)  
Fair value of plan assets at end of year 0 0 $ 0
Funded (unfunded) status $ (24,961) $ (24,991)