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Defined Benefit and Other Postretirement Benefits - Plan Assets Measured at Fair Value (Details) - Trustmark Capital Accumulation Plan [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Asset target allocations [Abstract]      
Fair value of plan assets $ 74,137 $ 86,287 $ 126,142
Level 1 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 74,137 86,133  
Level 2 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 0 0  
Level 3 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 0 154  
Money Market Funds [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 2,678 7,544  
Money Market Funds [Member] | Level 1 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 2,678 7,544  
Money Market Funds [Member] | Level 2 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 0 0  
Money Market Funds [Member] | Level 3 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 0 0  
Fixed Income Mutual Funds [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 21,472 10,267  
Fixed Income Mutual Funds [Member] | Level 1 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 21,472 10,267  
Fixed Income Mutual Funds [Member] | Level 2 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 0 0  
Fixed Income Mutual Funds [Member] | Level 3 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 0 0  
Equity Mutual Funds [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 11,922 62,265  
Equity Mutual Funds [Member] | Level 1 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 11,922 62,265  
Equity Mutual Funds [Member] | Level 2 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 0 0  
Equity Mutual Funds [Member] | Level 3 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 0 0  
Equity Securities [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 38,065 6,057  
Equity Securities [Member] | Level 1 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 38,065 6,057  
Equity Securities [Member] | Level 2 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 0 0  
Equity Securities [Member] | Level 3 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets 0 0  
Fixed Income Hedge Funds [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets   154  
Fixed Income Hedge Funds [Member] | Level 1 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets   0  
Fixed Income Hedge Funds [Member] | Level 2 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets   0  
Fixed Income Hedge Funds [Member] | Level 3 [Member]      
Asset target allocations [Abstract]      
Fair value of plan assets $ 0 $ 154 $ 163