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Employee Benefit Plans - Changes in projected benefit obligation, plan assets and funded status (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Change in projected benefit obligation      
Projected benefit obligation at beginning of year $ 61,557 $ 63,260  
Interest cost 2,407 2,157 $ 2,045
Benefits paid (1,758) (2,196)  
Actuarial (gain) loss 6,321 (1,664)  
Projected benefit obligation at end of year 68,527 61,557 63,260
Change in plan assets      
Balance at beginning of period 58,648 57,110  
Actual return on plan assets 6,860 965  
Employer contributions 842 2,768  
Benefits paid (1,757) (2,195)  
Balance at end of period 64,593 58,648 $ 57,110
Funded status at end of year $ (3,934) $ (2,909)