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Employee Benefit Plans, Supplemental Executive Retirement Plan (Details) - Supplemental Executive Retirement Plan [Member]
$ in Thousands
12 Months Ended
Jun. 30, 2019
USD ($)
Installment
Jun. 30, 2018
USD ($)
Supplement Executive Retirement Plan [Abstract]    
Vesting period 10 years  
Period in which lump sum benefit will be paid in the event of death, disability or termination 2 years  
Number of annual installments in which benefit will be paid | Installment 10  
Net periodic pension costs $ 916 $ 686
Postemployment benefits liability $ 5,000 $ 3,900
Deferred Base Salary [Member]    
Supplement Executive Retirement Plan [Abstract]    
Maximum annual contribution per employee 50.00%  
Deferred Annual Bonus [Member]    
Supplement Executive Retirement Plan [Abstract]    
Maximum annual contribution per employee 100.00%