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Defined Benefit and Other Postretirement Benefits
 9 Months Ended
Sep. 30, 2012
Defined Benefit and Other Postretirement Benefits [Abstract]  
Defined Benefit and Other Postretirement Benefits
Note 10 –
Defined Benefit and Other Postretirement Benefits

Capital Accumulation Plan

Trustmark maintains a noncontributory defined benefit pension plan (Trustmark Capital Accumulation Plan), which covers substantially all associates employed prior to 2007. The plan provides retirement benefits that are based on the length of credited service and final average compensation, as defined in the plan and vest upon three years of service.  In an effort to control expenses, the Board voted to freeze plan benefits effective during 2009, with the exception of certain associates covered through plans obtained by acquisitions.  Individuals will not earn additional benefits, except for interest as required by the IRS regulations, after the effective date.  Associates will retain their previously earned pension benefits.

The following table presents information regarding the plan's net periodic benefit cost for the periods presented ($ in thousands):

   
Three Months Ended September 30,
  
Nine Months Ended September 30,
 
   
2012
  
2011
  
2012
  
2011
 
Net periodic benefit cost
            
Service cost
 $134  $124  $413  $398 
Interest cost
  947   1,115   2,837   3,345 
Expected return on plan assets
  (1,438)  (1,470)  (4,238)  (4,412)
Recognized net actuarial loss
  1,303   1,026   3,921   3,100 
Net periodic benefit cost
 $946  $795  $2,933  $2,431 

The acceptable range of contributions to the plan is determined each year by the plan's actuary.  Trustmark's policy is to fund amounts allowable for federal income tax purposes.  The actual amount of the contribution is determined based on the plan's funded status and return on plan assets as of the measurement date, which is December 31.  In July 2012, the Moving Ahead for Progress in the 21st Century Act ("MAP-21") became effective.  Through MAP-21, Congress provides pension sponsors with funding relief by stabilizing interest rates used to determine required funding contributions to defined benefit plans.  Under MAP-21, instead of using a two-year average of these rates, plan sponsors determine required pension funding contributions based on a 25-year average of these rates with a cap and a floor.  For 2012, the cap is set at 110% and the floor is set at 90% of the 25-year average of these rates as of September 30, 2011.  As a result, Trustmark expects its minimum required contribution for 2012 to be reduced from $3.0 million to $1.6 million.  During 2011, Trustmark made a contribution of $1.0 million for the 2011 plan year.
 
Supplemental Retirement Plan

Trustmark maintains a nonqualified supplemental retirement plan covering directors who elected to defer fees, key executive officers and senior officers.  The plan provides for defined death benefits and/or retirement benefits based on a participant's covered salary.  Trustmark has acquired life insurance contracts on the participants covered under the plan, which may be used to fund future payments under the plan.  The measurement date for the plan is December 31. The following table presents information regarding the plan's net periodic benefit cost for the periods presented ($ in thousands):

   
Three Months Ended September 30,
  
Nine Months Ended September 30,
 
   
2012
  
2011
  
2012
  
2011
 
Net periodic benefit cost
            
Service cost
 $170  $147  $510  $441 
Interest cost
  517   569   1,550   1,707 
Amortization of prior service cost
  63   59   188   177 
Recognized net actuarial loss
  215   124   645   372 
Net periodic benefit cost
 $965  $899  $2,893  $2,697