XML 150 R105.htm IDEA: XBRL DOCUMENT v2.4.0.8
Employee Benefit Plans - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Age
Services
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee pretax contribution percentage 100.00%    
Employees compensation 50.00%    
Corporations contributions $ 431 $ 397 $ 385
Profit sharing contributions 6.00%    
Compensation percentage in excess of specified amount 5.70%    
Excess of compensation 114    
Recognized profit sharing expense 855 783 667
Obligations of other liabilities 4,120 3,792  
Expenses related employee benefit plans 541 728 647
Obligations under survivor benefit plan 932 813  
Other liabilities related to survivor benefit plan 119 127 106
Employee retirement health care benefits plan 60    
Minimum service period for participation in benefit plan 30    
Accumulated benefit obligation 2,485 2,224  
Amortized from accumulated other comprehensive income into net periodic benefit cost 149    
Weighted average discount rate net periodic benefit cost 3.88% 4.29% 5.50%
Weighted average rate accrued benefit obligations 4.31% 3.88% 4.29%
Expected costs of benefit 5.00%    
Percent rate of increase in the health care trend 1.00%    
Increase in health care trend rates 241    
Increase service and interest costs 21    
Percent rate of decrease in the health care trend 1.00%    
Decrease in health care trend rates 217    
Decrease service and interest costs $ 19    
Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee contribution percentage 1.00%    
Total contributed by employee percentage 1.00%    
Qualifying dependents age group 60    
Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee contribution percentage 3.00%    
Total contributed by employee percentage 4.00%    
Qualifying dependents age group 65