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Employee Benefits (Schedule of fair value of pension plan assets, by fair value hierarchy) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value $ 16,501 $ 16,906
Defined Benefit Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value 16,501 16,906
Defined Benefit Pension Plan | Investment in separate accounts fixed income    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value 11,309 11,600
Defined Benefit Pension Plan | Investment in separate accounts equity    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets at fair value 5,192 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 16,501 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 11,309 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 $ 5,192 $ 5,306