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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2015
Shareholders' Equity [Abstract]  
Table of actual regulatory capital amounts and ratios
The following table provides Trustmark's and TNB's actual regulatory capital amounts and ratios under regulatory capital standards in effect at March 31, 2015 (Basel III) and December 31, 2014 (Basel I) ($ in thousands):

  
Actual
Regulatory Capital
  
Minimum
  
To Be Well
 
  
Amount
  
Ratio
  
Requirement
  
Capitalized
 
At March 31, 2015:
 
  
  
  
 
Common Equity Tier 1 Capital (to Risk Weighted Assets)
        
Trustmark Corporation
 
$
1,117,340
   
13.14
%
  
4.50
%
  
n/
a
Trustmark National Bank
  
1,156,239
   
13.60
%
  
4.50
%
  
6.50
%
                 
Tier 1 Capital (to Risk Weighted Assets)
                
Trustmark Corporation
 
$
1,175,578
   
13.83
%
  
6.00
%
  
n/
a
Trustmark National Bank
  
1,156,239
   
13.60
%
  
6.00
%
  
8.00
%
                 
Total Capital (to Risk Weighted Assets)
                
Trustmark Corporation
 
$
1,268,725
   
14.92
%
  
8.00
%
  
n/
a
Trustmark National Bank
  
1,249,386
   
14.70
%
  
8.00
%
  
10.00
%
                 
Tier 1 Leverage (to Average Assets)
                
Trustmark Corporation
 
$
1,175,578
   
9.99
%
  
4.00
%
  
n/
a
Trustmark National Bank
  
1,156,239
   
9.84
%
  
4.00
%
  
5.00
%
                 
At December 31, 2014:
                
Common Equity Tier 1 Capital (to Risk Weighted Assets)
                
Trustmark Corporation
 
$
1,069,630
   
12.75
%
  
n/
a
  
n/
a
Trustmark National Bank
  
1,108,399
   
13.24
%
  
n/
a
  
n/
a
                 
Tier 1 Capital (to Risk Weighted Assets)
                
Trustmark Corporation
 
$
1,129,630
   
13.47
%
  
4.00
%
  
n/
a
Trustmark National Bank
  
1,108,399
   
13.24
%
  
4.00
%
  
6.00
%
                 
Total Capital (to Risk Weighted Assets)
                
Trustmark Corporation
 
$
1,221,292
   
14.56
%
  
8.00
%
  
n/
a
Trustmark National Bank
  
1,198,697
   
14.32
%
  
8.00
%
  
10.00
%
                 
Tier 1 Leverage (to Average Assets)
                
Trustmark Corporation
 
$
1,129,630
   
9.63
%
  
4.00
%
  
n/
a
Trustmark National Bank
  
1,108,399
   
9.46
%
  
4.00
%
  
5.00
%
Components of accumulated other comprehensive income (loss) and the related tax effects
The following table presents the components of accumulated other comprehensive loss and the related tax effects allocated to each component for the three months ended March 31, 2015 and 2014 ($ in thousands).  Reclassification adjustments related to securities available for sale are included in securities gains, net in the accompanying consolidated statements of income.  The amortization of prior service cost, recognized net loss due to lump sum settlements and change in net actuarial loss on pension and other postretirement benefit plans are included in the computation of net periodic benefit cost (see Note 9 – Defined Benefit and Other Postretirement Benefits for additional details).  Reclassification adjustments related to the cash flow hedge derivative are included in other interest expense in the accompanying consolidated statements of income.
 
  
Before Tax
Amount
  
Tax (Expense)
Benefit
  
Net of Tax
Amount
 
Three Months Ended March 31, 2015:
      
Securities available for sale and transferred securities:
      
Unrealized holding gains arising during the period
 
$
18,438
  
$
(7,052
)
 
$
11,386
 
Reclassification adjustment for net gains realized in net income
  
-
   
-
   
-
 
Change in net unrealized holding loss on securities transferred to held to maturity
  
1,415
   
(541
)
  
874
 
Total securities available for sale and transferred securities
  
19,853
   
(7,593
)
  
12,260
 
Pension and other postretirement benefit plans:
            
Net change in prior service costs
  
63
   
(24
)
  
39
 
Recognized net loss due to lump sum settlements
  
417
   
(160
)
  
257
 
Change in net actuarial loss
  
1,220
   
(466
)
  
754
 
Total pension and other postretirement benefit plans
  
1,700
   
(650
)
  
1,050
 
Derivatives:
            
Change in accumulated gain on effective cash flow hedge derivatives
  
(985
)
  
377
   
(608
)
Reclassification adjustment for loss realized in net income
  
211
   
(81
)
  
130
 
Total cash flow hedge derivatives
  
(774
)
  
296
   
(478
)
Total other comprehensive income
 
$
20,779
  
$
(7,947
)
 
$
12,832
 
             
Three Months Ended March 31, 2014:
            
Securities available for sale and transferred securities:
            
Unrealized holding gains arising during the period
 
$
6,848
  
$
(2,619
)
 
$
4,229
 
Reclassification adjustment for net gains realized in net income
  
(389
)
  
149
   
(240
)
Change in net unrealized holding loss on securities transferred to held to maturity
  
1,333
   
(510
)
  
823
 
Total securities available for sale and transferred securities
  
7,792
   
(2,980
)
  
4,812
 
Pension and other postretirement benefit plans:
            
Net change in prior service costs
  
63
   
(24
)
  
39
 
Recognized net loss due to lump sum settlements
  
375
   
(143
)
  
232
 
Change in net actuarial loss
  
906
   
(347
)
  
559
 
Total pension and other postretirement benefit plans
  
1,344
   
(514
)
  
830
 
Derivatives:
            
Change in accumulated gain on effective cash flow hedge derivatives
  
(661
)
  
253
   
(408
)
Total other comprehensive income
 
$
8,475
  
$
(3,241
)
 
$
5,234
 
Components of reclassifications out of accumulated other comprehensive income
The following table presents the changes in the balances of each component of accumulated other comprehensive loss for the three months ended March 31, 2015 and 2014 ($ in thousands).  All amounts are presented net of tax.

  
Securities
Available for Sale
 and Transferred
Securities
  
Defined
Benefit
Pension Items
  
Cash Flow
 Hedge
Derivatives
  
Total
 
Balance at January 1, 2015
 
$
(11,003
)
 
$
(31,617
)
 
$
136
  
$
(42,484
)
Other comprehensive income before reclassification
  
12,260
   
1,050
   
(608
)
  
12,702
 
Amounts reclassified from accumulated other comprehensive loss
  
-
   
-
   
130
   
130
 
Net other comprehensive income (loss)
  
12,260
   
1,050
   
(478
)
  
12,832
 
Balance at March 31, 2015
 
$
1,257
  
$
(30,567
)
 
$
(342
)
 
$
(29,652
)
                 
Balance at January 1, 2014
 
$
(25,462
)
 
$
(19,793
)
 
$
1,524
  
$
(43,731
)
Other comprehensive income (loss) before reclassification
  
5,052
   
830
   
(408
)
  
5,474
 
Amounts reclassified from accumulated other comprehensive income
  
(240
)
  
-
   
-
   
(240
)
Net other comprehensive income (loss)
  
4,812
   
830
   
(408
)
  
5,234
 
Balance at March 31, 2014
 
$
(20,650
)
 
$
(18,963
)
 
$
1,116
  
$
(38,497
)