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Employee Benefit Plans - Changes in Projected Benefit Obligation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Change in benefit obligation:      
Actuarial gain $ (32,400) $ (6,400)  
DB Pension Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 93,009 98,021  
Service cost 0 0 $ 0
Interest cost 1,985 1,628 2,371
Plan participants’ contributions 0 0  
Actuarial gain (20,729) (2,834)  
Benefits paid (3,744) (3,806)  
Benefit obligation at end of year 70,521 93,009 98,021
Change in plan assets:      
Fair value of plan assets at beginning of year 96,393 89,172  
Actual return on plan assets (13,764) 11,027  
Plan participants’ contributions 0 0  
Employer contributions 0 0  
Benefits paid (3,744) (3,806)  
Fair value of plan assets at end of year 78,885 96,393 89,172
Funded (unfunded) status 8,364 3,384  
Life and Healthcare Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 10,055 10,508  
Service cost 174 186 173
Interest cost 223 180 245
Plan participants’ contributions 100 108  
Actuarial gain (2,598) (574)  
Benefits paid (351) (353)  
Benefit obligation at end of year 7,603 10,055 10,508
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 100 108  
Employer contributions 251 245  
Benefits paid (351) (353)  
Fair value of plan assets at end of year 0 0 0
Funded (unfunded) status (7,603) (10,055)  
SERP Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 34,033 36,710  
Service cost 78 231 214
Interest cost 814 692 914
Plan participants’ contributions 0 0  
Actuarial gain (9,083) (3,002)  
Benefits paid (851) (598)  
Benefit obligation at end of year 24,991 34,033 36,710
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 850 598  
Benefits paid (850) (598)  
Fair value of plan assets at end of year 0 0 $ 0
Funded (unfunded) status $ (24,991) $ (34,033)