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Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]          
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%    
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%    
Funding and administrative costs of noncontributory defined benefit retirement plan and 401(k) plan [Abstract]          
401(k) plan $ 86 $ 81 $ 263 $ 242  
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 220 309 763 725  
Components of net periodic pension cost [Abstract]          
Service cost 10 17 29 51  
Interest cost 17 15 51 45  
Amortization of unrecognized net loss 0 0 128 0  
Amortization of unrecognized prior service cost 43 4 0 12  
Net periodic pension cost 70 $ 36 208 $ 108  
Recognized in accumulated other comprehensive income [Abstract]          
Net actuarial loss $ 254   $ 254   $ 339