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Retirement Plans (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Qualified Noncontributory Defined Benefit Retirement Plan [Member]
Sep. 30, 2013
Qualified Noncontributory Defined Benefit Retirement Plan [Member]
Sep. 30, 2014
Qualified Noncontributory Defined Benefit Retirement Plan [Member]
Sep. 30, 2013
Qualified Noncontributory Defined Benefit Retirement Plan [Member]
Sep. 30, 2014
401(k) Plan [Member]
Sep. 30, 2013
401(k) Plan [Member]
Sep. 30, 2014
401(k) Plan [Member]
Sep. 30, 2013
401(k) Plan [Member]
Sep. 30, 2014
Nonqualified Defined Benefit Retirement Plan [Member]
Sep. 30, 2013
Nonqualified Defined Benefit Retirement Plan [Member]
Sep. 30, 2014
Nonqualified Defined Benefit Retirement Plan [Member]
Sep. 30, 2013
Nonqualified Defined Benefit Retirement Plan [Member]
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]                            
Qualified noncontributory defined benefit retirement plan     $ 309 $ 31 $ 725 $ 93                
401(k) plan             81 75 242 229        
Components of net periodic pension cost [Abstract]                            
Service cost                     17 18 51 54
Interest cost                     15 12 45 35
Amortization of unrecognized net loss                     0 6 0 18
Amortization of unrecognized prior service cost                     4 7 12 21
Net periodic pension cost                     36 43 108 128
Recognized in accumulated other comprehensive income [Abstract]                            
Net actuarial loss 70 70                        
Past service cost 3 10                        
Total $ 73 $ 80