padding the levee board payroll

Under the new administration, inspections were lax. Edwards had other priorities, like bringing casino gambling to New Orleans. A new gambling bill passed the legislature. Robert Harvey lured Bally's into opening a riverboat casino at a dock owned by the levee board. In due course the FBI was investigating Harvey for padding the levee board payroll.
What does the 'padding ' means here? Does it means 'fake'? many thanks.
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