Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Pension Plans, Defined Benefit
Components of net periodic benefit costs:
Interest cost	$ 109	$ 131	$ 224	$ 274
Expected return on plan assets	(121)	(150)	(251)	(319)
Amortization of net loss	31	36	64	69
Settlement of benefit obligation	(103)	(536)	(372)	(1,022)
Net periodic benefit cost	122	553	409	1,046
Projected benefit obligation	12,437		12,437		$ 13,695
Before Settlement	12,695		12,695
Impact of Settlements	258
Fair value of plan assets	7,536		7,536		8,259
Before Settlement	7,794		7,794
Impact of Settlements	(258)
Funded status	(4,901)		(4,901)		(5,436)
Gross unrealized loss (gain)	5,036		5,036		$ 5,979
Before Settlement	$ 5,139		$ 5,139
Discount rate	3.70%		3.70%		3.50%
Expected return on plan assets	7.50%				7.50%
Other Postretirement Benefit Plans, Defined Benefit
Components of net periodic benefit costs:
Interest cost	$ 1	2	$ 2	3
Amortization of net loss	(1)	(2)	(2)	(4)
Net periodic benefit cost	$ 0	$ 0	$ 0	$ (1)
Other Postretirement Benefit Plans, Defined Benefit | Employees Hired before January 1, 2003
Components of net periodic benefit costs:
Benefit based on highest average salary for number of consecutive years			5 years
Number of years for consecutive years calculation			10 years
Other Postretirement Benefit Plans, Defined Benefit | Employees Hired on or after January 1, 2003
Components of net periodic benefit costs:
Percent of annual salary to calculate benefit			2.00%