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Employee Benefits (Schedule of fair value of pension plan assets, by fair value hierarchy) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at fair value | $ 17,729 | $ 16,906
Defined Benefit Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at fair value | 17,729 | 16,906
Defined Benefit Pension Plan | Investment in separate accounts fixed income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at fair value | 12,015 | 11,600
Defined Benefit Pension Plan | Investment in separate accounts equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at fair value | 5,714 | 5,306
Quoted Prices Active Markets for Identical Assets (Level 1) | Defined Benefit Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan assets at fair value | 17,729 | 16,906
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 | 12,015 | 11,600
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 | $ 5,714 | $ 5,306

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