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Employee Benefit Plans (Tables)
 6 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic pension expense
​ ​ ​
Three Months
 ​ ​
Six Months
 ​
For the Periods Ended December 31
 ​ ​
2015
 ​ ​
2014
 ​ ​
2015
 ​ ​
2014
 ​
Service cost – benefits earned during the period
 ​ ​ ​ $ 751 ​ ​ ​ ​ $ 656 ​ ​ ​ ​ $ 1,470 ​ ​ ​ ​ $ 1,477 ​ ​
Interest cost on benefit obligation
 ​ ​ ​ ​ 757 ​ ​ ​ ​ ​ 574 ​ ​ ​ ​ ​ 1,446 ​ ​ ​ ​ ​ 1,309 ​ ​
Expected return on plan assets
 ​ ​ ​ ​ (846) ​ ​ ​ ​ ​ (648) ​ ​ ​ ​ ​ (1,588) ​ ​ ​ ​ ​ (1,414) ​ ​
Amortization of net actuarial (gain) loss and prior 
service costs
 ​ ​ ​ ​ 508 ​ ​ ​ ​ ​ 417 ​ ​ ​ ​ ​ 892 ​ ​ ​ ​ ​ 702 ​ ​
Net periodic pension expense
 ​ ​ ​ $ 1,170 ​ ​ ​ ​ $ 999 ​ ​ ​ ​ $ 2,220 ​ ​ ​ ​ $ 2,074 ​ ​
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