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Employee Benefit Plans (Tables)
 3 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic pension expense
​
​ ​ ​
Three Months
 ​
For the Periods Ended September 30
 ​ ​
2015
 ​ ​
2014
 ​
Service cost – benefits earned during the period
 ​ ​ ​ $ 719 ​ ​ ​ ​ $ 821 ​ ​
Interest cost on benefit obligation
 ​ ​ ​ ​ 689 ​ ​ ​ ​ ​ 734 ​ ​
Expected return on plan assets
 ​ ​ ​ ​ (742) ​ ​ ​ ​ ​ (766) ​ ​
Amortization of net actuarial loss and prior service costs
 ​ ​ ​ ​ 384 ​ ​ ​ ​ ​ 286 ​ ​
Net periodic pension expense
 ​ ​ ​ $ 1,050 ​ ​ ​ ​ $ 1,075 ​ ​
​