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Employee Benefit Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Hour
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Company combined number of retirement plans 3    
KSOP Defined Contribution Plan
     
Defined Benefit Plan Disclosure [Line Items]      
Minimum service hours for participation into plan 1,000    
Percentage of the participants' eligible compensation 2.00%    
Minimum age for participation into plan 18 years    
Discretionary profit sharing contribution percentage 2.00%    
Years until employer contribution is fully vested under ratable method 6 years    
Defined contribution plan employer contribution $ 600,000 $ 631,000 $ 562,000
KSOP Salary Saving Plan
     
Defined Benefit Plan Disclosure [Line Items]      
Minimum age for participation into plan 18 years    
Years until employer contribution is fully vested under ratable method 6 years    
Minimum service days for participation into plan 30 days    
Specified limits of salary contribution to plan 50.00%    
Maximum percentage of eligible compensation for employer matching contribution 6.00%    
Defined contribution plan, employer matching contribution, amount 497,000 444,000 438,000
KSOP Employee Stock Ownership Plan
     
Defined Benefit Plan Disclosure [Line Items]      
Minimum age for participation into plan 18 years    
Years until employer contribution is fully vested under ratable method 6 years    
Minimum service years for participation into plan 1 year    
ESOP compensation expense 0 139,000 119,000
Released ESOP earned shares 0    
Released ESOP unearned shares 0    
Deferred Compensation Plan
     
Defined Benefit Plan Disclosure [Line Items]      
Compensation expense under deferred compensation plan 445,000 312,000  
Company's contribution under deferred compensation plan $ 155,000 $ 150,000