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Employee Benefit Plans (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Service
Age
Dec. 31, 2011
Dec. 31, 2010
Employee Benefit Plans (Additional Textual) [Abstract]      
Employee pretax contribution percentage 100.00%    
Employees compensation 50.00%    
Corporations contributions $ 397 $ 385 $ 350
Profit sharing contributions 6.00%    
Compensation percentage in excess of specified amount 5.70%    
Excess of compensation 110    
Recognized profit sharing expense 783 667 641
Obligations of other liabilities 3,792 3,276  
Expenses related employee benefit plans 728 647 227
Obligations under survivor benefit plan 813 686  
Other liabilities related to survivor benefit plan 127 106 21
Employee Retirement Health Care Benefits Plan 60    
Minimum service period for participation in benefit plan 30    
Accumulated benefit obligation 2,224 1,674  
Amortized from accumulated other comprehensive income into net periodic benefit cost 54 7  
Weighted average discount rate net periodic benefit cost 4.29% 5.50% 5.75%
Weighted average rate accrued benefit obligations 3.88% 4.29% 5.50%
Expected costs of benefit 5.00%    
Percent rate of increase in the health care trend 1.00%    
Increase in health care trend rates 289    
Increase service and interest costs 43    
Percent rate of decrease in the health care trend 1.00%    
Decrease in health care trend rates 247    
Decrease service and interest costs $ 34    
Maximum [Member]
      
Employee Benefit Plans (Textual) [Abstract]      
Employee contribution percentage 3.00%    
Total contributed by employee percentage 4.00%    
Qualifying dependents age group 65    
Minimum [Member]
      
Employee Benefit Plans (Textual) [Abstract]      
Employee contribution percentage 1.00%    
Total contributed 1.00%    
Qualifying dependents age group 60