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Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
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 $ 102 $ 83  
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 260 220  
Components of net periodic pension cost [Abstract]      
Service cost 0 10  
Interest cost 17 19  
Amortization of unrecognized net loss 0 42  
Net periodic pension cost 17 $ 71  
Recognized in accumulated other comprehensive income [Abstract]      
Net actuarial loss (16)   $ (16)
Past service cost 0   0
Total recognized in accumulated other comprehensive income (loss), net of tax $ (16)   $ (16)