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Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]      
Automatic Annual Contribution Employees Hired Before January 1, 2009 Benefit Reduction Under Certain Amendments Minimum 5.00%    
Automatic Annual Contribution Employees Hired Before January 1, 2009 Due Benefit Reduction Under Certain Amendments Maximum 7.00%    
Employer's matching contribution to 401(k) of employees hired on or after January 1, 2009 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 $ 83 $ 87  
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 220 270  
Components of net periodic pension cost [Abstract]      
Service cost 10 9  
Interest cost 19 17  
Amortization of unrecognized net loss 42 42  
Net periodic pension cost 71 $ 68  
Recognized in accumulated other comprehensive income [Abstract]      
Net actuarial loss $ 205   $ 233