Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Pension Benefits [Member]
Components of net periodic cost:
Service cost	$ 23	$ 24
Interest cost	216	224
Expected return on plan assets	(123)	(124)
Recognized net actuarial (gain) loss	228	140
Amortization of prior service cost	22	22
Net periodic cost	366	286
Postretirement Health Coverage [Member]
Components of net periodic cost:
Service cost	6	13
Interest cost	19	24
Expected return on plan assets	0	0
Recognized net actuarial (gain) loss	(53)	(22)
Amortization of prior service cost	(68)	(68)
Net periodic cost	$ (96)	$ (53)