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Defined Benefit and Other Postretirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2014
Trustmark Capital Accumulation Plan [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Plan benefit obligation, plan assets and funded status of the plan
The following tables present information regarding the benefit obligation, plan assets, funded status, amounts recognized in accumulated other comprehensive loss, net periodic benefit cost and other statistical disclosures for Trustmark’s qualified defined benefit pension plans (Trustmark Capital Accumulation Plan and BancTrust Pension Plan) ($ in thousands):

  
December 31,
 
  
2014
  
2013
 
Change in benefit obligation:
    
Benefit obligation, beginning of year
 
$
128,974
  
$
103,235
 
Benefit obligation from business combination
  
-
   
43,138
 
Service cost
  
495
   
595
 
Interest cost
  
5,299
   
4,758
 
Actuarial loss (gain)
  
11,675
   
(8,060
)
Benefits paid for BancTrust Pension Plan
  
(38,853
)
  
-
 
Benefits paid for Trustmark Capital Accumulation Plan
  
(7,041
)
  
(14,692
)
Settlement loss from BancTrust termination
  
1,355
   
-
 
Benefit obligation, end of year
 
$
101,904
  
$
128,974
 
         
Change in plan assets:
        
Fair value of plan assets, beginning of year
 
$
126,142
  
$
76,660
 
Fair value of plan assets from business combination
  
-
   
40,391
 
Actual return on plan assets
  
4,632
   
21,661
 
Employer contributions
  
1,407
   
2,122
 
Benefit payments for BancTrust Pension Plan
  
(38,853
)
  
-
 
Benefit payments for Trustmark Capital Accumulation Plan
  
(7,041
)
  
(14,692
)
Fair value of plan assets, end of year
 
$
86,287
  
$
126,142
 
         
Funded status at end of year - net liability
 
$
(15,617
)
 
$
(2,832
)
         
Amounts recognized in accumulated other comprehensive loss:
        
Net loss - amount recognized
 
$
28,100
  
$
15,436
 
Net periodic benefit Cost
  
Years Ended December 31,
 
  
2014
  
2013
  
2012
 
Net periodic benefit cost:
      
Service cost
 
$
495
  
$
595
  
$
547
 
Interest cost
  
5,299
   
4,758
   
3,942
 
Expected return on plan assets
  
(6,245
)
  
(7,720
)
  
(5,983
)
Recognized net loss due to BancTrust termination
  
1,355
   
-
   
-
 
Recognized net loss due to lump sum settlements
  
905
   
2,225
   
-
 
Recognized net actuarial (gain) loss
  
(283
)
  
5,516
   
5,225
 
Net periodic benefit cost
 
$
1,526
  
$
5,374
  
$
3,731
 
             
Other changes in plan assets and benefit obligation recognized in other comprehensive income (loss), before taxes:
            
Net loss (gain) - Total recognized in other comprehensive income (loss)
 
$
12,664
  
$
(29,742
)
 
$
(3,861
)
Total recognized in net periodic benefit cost and other comprehensive income (loss)
 
$
14,190
  
$
(24,368
)
 
$
(130
)
             
Weighted-average assumptions as of end of year:
            
Discount rate for benefit obligation
  
3.57
%
  
4.30
%
  
3.50
%
Discount rate for net periodic benefit cost
  
4.30
%
  
3.50
%
  
4.00
%
Expected long-term return on plan assets
  
7.50
%
  
7.50
%
  
8.00
%
Weighted-average asset allocation
The weighted-average asset allocations by asset category for Trustmark’s qualified defined benefit pension plans at December 31, 2014 and 2013 are presented below.  Due to the termination and full distribution of the BancTrust Pension Plan during 2014, December 31, 2014 includes only amounts related to the Trustmark Capital Accumulation Plan.

  
2014
  
2013
 
Money market fund
  
8.7
%
  
5.2
%
Fixed income mutual funds
  
11.9
%
  
17.6
%
Equity mutual funds
  
72.2
%
  
58.4
%
Equity securities
  
7.0
%
  
18.7
%
Fixed income hedge fund
  
0.2
%
  
0.1
%
Total
  
100.0
%
  
100.0
%
Plan assets measured at fair value
The following table sets forth by level, within the fair value hierarchy, the qualified defined benefit pension plans’ assets measured at fair value at December 31, 2014 and 2013 ($ in thousands):

  
December 31, 2014
 
  
Total
  
Level 1
  
Level 2
  
Level 3
 
Money market fund
 
$
7,544
  
$
7,544
  
$
-
  
$
-
 
Fixed income mutual funds
  
10,267
   
10,267
   
-
   
-
 
Equity mutual funds
  
62,265
   
62,265
   
-
   
-
 
Equity securities
  
6,057
   
6,057
   
-
   
-
 
Fixed income hedge fund
  
154
   
-
   
-
   
154
 
Total assets at fair value
 
$
86,287
  
$
86,133
  
$
-
  
$
154
 

  
December 31, 2013
 
  
Total
  
Level 1
  
Level 2
  
Level 3
 
Money market fund
 
$
6,563
  
$
6,563
  
$
-
  
$
-
 
Fixed income mutual funds
  
22,225
   
15,245
   
6,980
   
-
 
Equity mutual funds
  
73,608
   
73,608
   
-
   
-
 
Equity securities
  
23,583
   
23,583
   
-
   
-
 
Fixed income hedge fund
  
163
   
-
   
-
   
163
 
Total assets at fair value
 
$
126,142
  
$
118,999
  
$
6,980
  
$
163
 
Changes in fair value of plan level three assets
The following table sets forth a summary of changes in fair value of the Level 3 plan assets for the years ended December 31, 2014 and 2013 ($ in thousands):

  
Fixed Income Hedge Fund
 
Balance, January 1, 2013
 
$
163
 
Change in fair value
  
-
 
Balance, December 31, 2013
  
163
 
Change in fair value
  
(9
)
Balance, December 31, 2014
 
$
154
 
Estimated future benefit payments and other disclosures
The following table presents the expected benefit payments, which reflect expected future service, for Trustmark’s Capital Accumulation Plan ($ in thousands):

Year
 
Amount
 
2015
 
$
10,654
 
2016
  
8,402
 
2017
  
7,734
 
2018
  
6,346
 
2019
  
6,286
 
2020 - 2024
  
28,762
 
Supplemental Retirement Plans [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Plan benefit obligation, plan assets and funded status of the 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.  As a result of the BancTrust merger on February 15, 2013, Trustmark became the administrator of an additional nonqualified supplemental retirement plan, for which the plan benefits were frozen prior to the merger date.

The following tables present information regarding the benefit obligation, plan assets, funded status, amounts recognized in accumulated other comprehensive loss, net periodic benefit cost and other statistical disclosures for Trustmark’s nonqualified supplemental retirement plans ($ in thousands):

  
December 31,
 
  
2014
  
2013
 
Change in benefit obligation:
    
Benefit obligation, beginning of year
 
$
52,489
  
$
56,619
 
Benefit obligation from business combination
  
-
   
1,658
 
Service cost
  
296
   
597
 
Interest cost
  
2,198
   
1,943
 
Actuarial loss (gain)
  
7,392
   
(4,187
)
Benefits paid
  
(2,631
)
  
(4,141
)
Benefit obligation, end of year
 
$
59,744
  
$
52,489
 
         
Change in plan assets:
        
Fair value of plan assets, beginning of year
 
$
-
  
$
-
 
Employer contributions
  
2,631
   
4,141
 
Benefit payments
  
(2,631
)
  
(4,141
)
Fair value of plan assets, end of year
 
$
-
  
$
-
 
         
Funded status at end of year - net liability
 
$
(59,744
)
 
$
(52,489
)
         
Amounts recognized in accumulated other comprehensive loss:
        
Net loss
 
$
21,242
  
$
14,509
 
Prior service cost
  
1,860
   
2,110
 
Amounts recognized
 
$
23,102
  
$
16,619
 
Net periodic benefit Cost
  
Years Ended December 31,
 
  
2014
  
2013
  
2012
 
Net periodic benefit cost:
      
Service cost
 
$
296
  
$
597
  
$
679
 
Interest cost
  
2,198
   
1,943
   
2,067
 
Amortization of prior service cost
  
250
   
250
   
250
 
Recognized net actuarial loss
  
661
   
1,038
   
861
 
Net periodic benefit cost
 
$
3,405
  
$
3,828
  
$
3,857
 
             
Other changes in plan assets and benefit obligation recognized in other comprehensive income (loss), before taxes:
            
Net loss (gain)
 
$
6,733
  
$
(5,224
)
 
$
2,507
 
Prior service cost
  
-
   
-
   
198
 
Amortization of prior service cost
  
(250
)
  
(250
)
  
(250
)
Total recognized in other comprehensive income (loss)
 
$
6,483
  
$
(5,474
)
 
$
2,455
 
Total recognized in net periodic benefit cost and other comprehensive income (loss)
 
$
9,888
  
$
(1,646
)
 
$
6,312
 
             
Weighted-average assumptions as of end of year:
            
Discount rate for benefit obligation
  
3.57
%
  
4.30
%
  
3.50
%
Discount rate for net periodic benefit cost
  
4.30
%
  
3.50
%
  
4.00
%
Estimated future benefit payments and other disclosures
The following table presents the expected benefits payments for Trustmark’s supplemental retirement plans ($ in thousands):

Year
 
Amount
 
2015
 
$
2,868
 
2016
  
3,145
 
2017
  
3,479
 
2018
  
3,591
 
2019
  
3,656
 
2020 - 2024
  
19,504