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Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]          
Automatic Annual Contribution Employees Hired Before January 1, 2009 Benefit Reduction Under Certain Amendments Minimum, percent     5.00%    
Automatic Annual Contribution Employees Hired Before January 1, 2009 Due Benefit Reduction Under Certain Amendments Maximum, percent     7.00%    
Employer's matching contribution to 401(k) of employees hired on or after January 1, 2009, percent     50.00%    
Maximum annual contribution per employee, percent     3.00%    
Funding and administrative costs of noncontributory defined benefit retirement plan and 401(k) plan [Abstract]          
401(k) plan $ 77 $ 90 $ 160 $ 177  
Qualified noncontributory defined benefit retirement plan [Member]          
Funding and administrative costs of noncontributory defined benefit retirement plan and 401(k) plan [Abstract]          
Qualified noncontributory defined benefit retirement plan 220 273 440 543  
Components of net periodic pension cost [Abstract]          
Service cost 10 10 20 19  
Interest cost 19 17 38 34  
Amortization of unrecognized net loss 42 43 84 85  
Net periodic pension cost 71 $ 70 142 $ 138  
Recognized in accumulated other comprehensive income [Abstract]          
Net actuarial loss $ 177   $ 177   $ 233