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Employee Benefit Plans - Funded status of Retirement Income Plan and amounts recognized in consolidated balance sheets (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution by employer for retirement income plan | $ 5,400,000 |  |
Settlement loss | (18,286,000) | $ (2,921,000) |
Accumulated benefit obligation at end of year |  | 29,651,000 |
Change in projected benefit obligation: |  |  |
Projected benefit obligation at end of year | 0 |  |
Change in Plan assets: |  |  |
Employer contribution | 5,400,000 |  |
Fair value of Plan assets at end of year | 0 |  |
Retirement Income Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contribution by employer for retirement income plan | 5,454,000 |  |
Settlement loss | (18,286,000) | (2,921,000) |
Change in projected benefit obligation: |  |  |
Benefit obligation at beginning of year | 29,651,000 | 41,038,000 |
Service cost | 0 | 0 |
Interest cost | 22,000 | 972,000 | $ 988,000
Actuarial (gain) loss | (3,715,000) | (5,258,000) |
Benefits paid | (836,000) | (3,248,000) |
Transfer of assets | 524,000 |  |
Refund related to Plan trust dissolution | (310,000) |  |
Settlement | (25,122,000) | (3,853,000) |
Projected benefit obligation at end of year |  | 29,651,000 | 41,038,000
Change in Plan assets: |  |  |
Fair value of Plan assets at beginning of year | 20,041,000 | 35,339,000 |
Actual return on Plan assets | 249,000 | (8,197,000) |
Employer contribution | 5,454,000 |  |
Benefits paid | (836,000) | (3,248,000) |
Settlement | (25,122,000) | (3,853,000) |
Fair value of Plan assets at end of year |  | 20,041,000 | $ 35,339,000
Funded status at end of year |  | (9,610,000) |
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) CONSIST OF: |  |  |
Net loss | 0 | 22,476,000 |
Prior service cost (credit) | 0 | 0 |
Net transition obligation (asset) | 0 | 0 |
Before-tax amount | $ 0 | $ 22,476,000 |

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