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Employee Benefits (Schedule of fair value of pension plan assets, by fair value hierarchy) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 16,906 | $ 22,839 | $ 22,634
Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 16,906 | 22,839 |
Defined Benefit Pension Plan | Investment in separate accounts fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 11,600 | 15,689 |
Defined Benefit Pension Plan | Investment in separate accounts equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 5,306 | 7,150 |
Quoted Prices Active Markets for Identical Assets (Level 1) | Defined Benefit Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 16,906 | 22,839 |
Quoted Prices Active Markets for Identical Assets (Level 1) | Defined Benefit Pension Plan | Investment in separate accounts fixed income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | 11,600 | 15,689 |
Quoted Prices Active Markets for Identical Assets (Level 1) | Defined Benefit Pension Plan | Investment in separate accounts equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets at fair value | $ 5,306 | $ 7,150 |

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