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Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
DB Pension Plan      
Components of net periodic benefit cost      
Service cost $ 0 $ 0 $ 0
Interest cost 3,275 1,985 1,628
Expected return on plan assets (4,789) (5,885) (5,652)
Amortization of prior service (credit) cost 0 0 1
Recognized net actuarial loss 1,156 1,217 1,559
Net periodic benefit (credit) cost (358) (2,683) (2,464)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial gain (4,048) (1,080) (8,209)
Recognized actuarial (loss) gain (1,156) (1,217) (1,559)
Prior service credit 0 0 0
Recognized prior service cost (credit) 0 0 (1)
Recognized in other comprehensive income (loss) (5,204) (2,297) (9,769)
Total recognized in net periodic benefit cost and other comprehensive income (loss) (5,562) (4,980) (12,233)
Life and Healthcare Plan      
Components of net periodic benefit cost      
Service cost 33 174 186
Interest cost 354 223 180
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost (61) (61) (61)
Recognized net actuarial loss (40) 196 312
Net periodic benefit (credit) cost 286 532 617
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial gain (153) (2,598) (574)
Recognized actuarial (loss) gain 40 (196) (312)
Prior service credit 0 0 0
Recognized prior service cost (credit) 61 61 61
Recognized in other comprehensive income (loss) (52) (2,733) (825)
Total recognized in net periodic benefit cost and other comprehensive income (loss) 234 (2,201) (208)
SERP Plan      
Components of net periodic benefit cost      
Service cost 43 78 231
Interest cost 1,148 814 692
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost 278 277 282
Recognized net actuarial loss 0 847 1,080
Net periodic benefit (credit) cost 1,469 2,016 2,285
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial gain (315) (9,083) (3,002)
Recognized actuarial (loss) gain 0 (847) (1,080)
Prior service credit 0 0 0
Recognized prior service cost (credit) (278) (277) (282)
Recognized in other comprehensive income (loss) (593) (10,207) (4,364)
Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 876 $ (8,191) $ (2,079)