v3.26.1
Fair Value Measurements (Tables) - Trustmark 401(k) Plan [Member]
12 Months Ended
Dec. 31, 2025
Fair Value Hierarchy [Member]  
Fair Value Measurements [Abstract]  
Fair Value Measurements for Plan’s Assets and NAV Per Share
The following tables set forth by level, within the fair value hierarchy, the Plan's assets at fair value as of December 31, 2025 and 2024:
 
           
 

Assets at Fair Values as of December 31, 2025  
   
Level 1
   
Total
 
           
Mutual funds
 $160,140,231   $160,140,231 
Common stock of Trustmark Corporation
  16,473,118    16,473,118 
Self-directed brokerage accounts
  22,228,731    22,228,731 
           
Total investments at fair value
  198,842,080    198,842,080 
           
Collective investment funds measured at NAV*
   -     192,747,015 
Pooled separate account measured at NAV*
   -     40,594,374 
           
Total investments
 $198,842,080   $432,183,469 
 
           
 

Assets at Fair Values as of December 31, 2024  
   
Level 1
   
Total
 
           
Mutual funds
 $145,788,288   $145,788,288 
Common stock of Trustmark Corporation
  17,390,020    17,390,020 
Self-directed brokerage accounts
  17,858,332    17,858,332 
           
Total investments at fair value
  181,036,640    181,036,640 
           
Collective investment funds measured at NAV*
   -     174,713,346 
Pooled separate account measured at NAV*
   -     38,239,215 
           
Total investments
 $181,036,640   $393,989,201 
NAV Per Share [Member]  
Fair Value Measurements [Abstract]  
Fair Value Measurements for Plan’s Assets and NAV Per Share
The fair value of investments, other than Level 1, in certain entities that calculate NAV per share (or its equivalent), are as follows:
 
            
Investment   Fair Value at
December 31, 2025
    Unfunded
Commitments
  Redemption
Frequency
  Redemption
Notice Period
                
Collective investment funds
 $192,747,015     N/A   Daily  
Daily
Pooled separate account
  40,594,374     N/A   Daily  
Daily
 
            
Investment   Fair Value at
December 31, 2024
    Unfunded
Commitments
  Redemption
Frequency
  Redemption
Notice Period
                
Collective investment funds
 $174,713,346     N/A  
Daily
 
Daily
Pooled separate account
  38,239,215     N/A  
Daily
 
Daily