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Shareholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Total Capital (to Risk Weighted Assets) [Member]
Trustmark Corporation [Member]
Dec. 31, 2011
Total Capital (to Risk Weighted Assets) [Member]
Trustmark Corporation [Member]
Sep. 30, 2012
Total Capital (to Risk Weighted Assets) [Member]
Trustmark National Bank [Member]
Dec. 31, 2011
Total Capital (to Risk Weighted Assets) [Member]
Trustmark National Bank [Member]
Sep. 30, 2012
Tier 1 Capital (to Risk Weighted Assets) [Member]
Trustmark Corporation [Member]
Dec. 31, 2011
Tier 1 Capital (to Risk Weighted Assets) [Member]
Trustmark Corporation [Member]
Sep. 30, 2012
Tier 1 Capital (to Risk Weighted Assets) [Member]
Trustmark National Bank [Member]
Dec. 31, 2011
Tier 1 Capital (to Risk Weighted Assets) [Member]
Trustmark National Bank [Member]
Sep. 30, 2012
Tier 1 Capital (to Average Assets) [Member]
Trustmark Corporation [Member]
Dec. 31, 2011
Tier 1 Capital (to Average Assets) [Member]
Trustmark Corporation [Member]
Sep. 30, 2012
Tier 1 Capital (to Average Assets) [Member]
Trustmark National Bank [Member]
Dec. 31, 2011
Tier 1 Capital (to Average Assets) [Member]
Trustmark National Bank [Member]
Total Capital (to Risk Weighted Assets) [Abstract]                                
Actual Regulatory Capital Amount         $ 1,153,101 $ 1,096,213 $ 1,113,636 $ 1,057,932                
Actual Regulatory Capital Ratio (in hundredths)         17.25% 16.67% 16.85% 16.28%                
Minimum Regulatory Capital Required Amount         534,786 526,156 528,689 519,709                
Minimum Regulatory Capital Required Ratio (in hundredths)         8.00% 8.00% 8.00% 8.00%                
Minimum Regulatory Provision to be Well-Capitalized Amount            [1]    [1] 660,861 649,636                
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths)            [1]    [1] 10.00% 10.00%                
Tier 1 Capital (to Risk Weighted Assets) [Abstract]                                
Actual Regulatory Capital Amount                 1,029,598 974,034 992,978 938,122        
Actual Regulatory Capital Ratio (in hundredths)                 15.40% 14.81% 15.03% 14.44%        
Minimum Regulatory Capital Required Amount                 267,393 263,078 264,344 259,855        
Minimum Regulatory Capital Required Ratio (in hundredths)                 4.00% 4.00% 4.00% 4.00%        
Minimum Regulatory Provision to be Well-Capitalized Amount                    [1]    [1] 396,516 389,782        
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths)                    [1]    [1] 6.00% 6.00%        
Tier 1 Capital (to Average Assets) [Abstract]                                
Actual Regulatory Capital Amount                         1,029,598 974,034 992,978 938,122
Actual Regulatory Capital Ratio (in hundredths)                         10.83% 10.43% 10.57% 10.18%
Minimum Regulatory Capital Required Amount                         285,306 280,162 281,751 276,502
Minimum Regulatory Capital Required Ratio (in hundredths)                         3.00% 3.00% 3.00% 3.00%
Minimum Regulatory Provision to be Well-Capitalized Amount                            [1]    [1] 469,585 460,837
Minimum Regulatory Provision to be Well-Capitalized Ratio (in hundredths)                            [1]    [1] 5.00% 5.00%
Other Comprehensive Income (Loss) before Tax [Abstract]                                
Accumulated other comprehensive income (loss), Before - Tax, balance     5,089 (18,469)                        
Unrealized Holding Gain (Loss) on AFS Arising During Period, Before - Tax     2,970 46,696                        
Adjustment for net gains realized in net income, Before - Tax     (1,041) (91)                        
Pension and other postretirement benefit plans, Before - Tax     4,755 3,649                        
Accumulated other comprehensive income (loss), Before - Tax, balance 11,773 31,785 11,773 31,785                        
Other Comprehensive Income (Loss), Tax [Abstract]                                
Accumulated other comprehensive income (loss), Tax Effect, balance     (1,968) 7,043                        
Unrealized Holding Gain (Loss) on AFS Arising During Period, Tax Effect     (1,136) (17,861)                        
Adjustment for net gains realized in net income, tax effect     398 35                        
Pension and other postretirement benefit plans, Tax Effect, balance     (1,819) (1,396)                        
Accumulated other comprehensive income (loss), tax effect (4,525) (12,179) (4,525) (12,179)                        
Other Comprehensive Income (Loss), Net of Tax [Abstract]                                
Accumulated Other Comprehensive Income (Loss), Net of Tax, balance     3,121 (11,426)                        
Unrealized holding gain on AFS arising during period 2,618 15,205 1,834 28,835                        
Adjustment for net gains realized in net income 0 (20) (643) (56)                        
Pension and other postretirement benefit plans     2,936 2,253                        
Accumulated Other Comprehensive Income, Net of Tax, balance $ 7,248 $ 19,606 $ 7,248 $ 19,606                        
[1] n/a