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Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits [Member]        
Components of net periodic cost:        
Service cost $ 11 $ 31 $ 22 $ 62
Interest cost 174 184 348 367
Expected return on plan assets (133) (119) (266) (237)
Recognized net actuarial loss (gain) 46 106 92 212
Amortization of prior service cost 0 7 0 14
Net periodic cost (benefit) 98 209 196 418
Postretirement Health Coverage [Member]        
Components of net periodic cost:        
Service cost 4 4 8 9
Interest cost 13 13 26 26
Expected return on plan assets 0 0 0 0
Recognized net actuarial loss (gain) (30) (38) (60) (77)
Amortization of prior service cost (92) (92) (184) (184)
Net periodic cost (benefit) $ (105) $ (113) $ (210) $ (226)