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Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
DB Pension Plan      
Components of net periodic benefit cost      
Service cost $ 0 $ 0 $ 0
Interest cost 1,985 1,628 2,371
Expected return on plan assets (5,885) (5,652) (5,416)
Amortization of prior service (credit) cost 0 1 (10)
Recognized net actuarial loss 1,217 1,559 1,411
Recognized net actuarial gain due to curtailments 0 0 0
Net periodic benefit (credit) cost (2,683) (2,464) (1,644)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) (1,080) (8,209) 3,899
Recognized actuarial loss (1,217) (1,559) (1,411)
Prior service credit 0 0 0
Recognized prior service cost (credit) 0 (1) 10
Prior service cost (credit) recognized due to curtailment 0 0 0
Recognized in other comprehensive income (loss) (2,297) (9,769) 2,498
Total recognized in net periodic benefit cost and other comprehensive income (loss) (4,980) (12,233) 854
Life and Healthcare Plan      
Components of net periodic benefit cost      
Service cost 174 186 173
Interest cost 223 180 245
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost (61) (61) (61)
Recognized net actuarial loss 196 312 155
Recognized net actuarial gain due to curtailments 0 0 0
Net periodic benefit (credit) cost 532 617 512
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) (2,598) (574) 1,340
Recognized actuarial loss (196) (312) (155)
Prior service credit 0 0 0
Recognized prior service cost (credit) 61 61 61
Prior service cost (credit) recognized due to curtailment 0 0 0
Recognized in other comprehensive income (loss) (2,733) (825) 1,246
Total recognized in net periodic benefit cost and other comprehensive income (loss) (2,201) (208) 1,758
SERP Plan      
Components of net periodic benefit cost      
Service cost 78 231 214
Interest cost 814 692 914
Expected return on plan assets 0 0 0
Amortization of prior service (credit) cost 277 282 285
Recognized net actuarial loss 847 1,080 800
Recognized net actuarial gain due to curtailments 0 0 0
Net periodic benefit (credit) cost 2,016 2,285 2,213
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Net actuarial loss (gain) (9,083) (3,002) 4,070
Recognized actuarial loss (847) (1,080) (800)
Prior service credit 0 0 0
Recognized prior service cost (credit) (277) (282) (285)
Prior service cost (credit) recognized due to curtailment 0 0 0
Recognized in other comprehensive income (loss) (10,207) (4,364) 2,985
Total recognized in net periodic benefit cost and other comprehensive income (loss) $ (8,191) $ (2,079) $ 5,198