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LHFI and Allowance for Loan Losses, LHFI - Loan Portfolio Held for Investment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Loan Portfolio [Abstract]    
Total LHFI [1] $ 8,569,967 $ 7,851,213
Less allowance for loan losses, LHFI 76,733 71,265
Net LHFI 8,493,234 7,779,948
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Loan Portfolio [Abstract]    
Total LHFI 987,624 831,437
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Loan Portfolio [Abstract]    
Total LHFI 1,675,311 1,660,043
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Loan Portfolio [Abstract]    
Total LHFI 517,956 318,148
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Loan Portfolio [Abstract]    
Total LHFI 2,193,823 2,034,176
Commercial and Industrial Loans [Member]    
Loan Portfolio [Abstract]    
Total LHFI 1,570,345 1,528,434
Consumer Loans [Member]    
Loan Portfolio [Abstract]    
Total LHFI 171,918 170,562
State and Other Political Subdivision Loans [Member]    
Loan Portfolio [Abstract]    
Total LHFI 952,483 917,515
Other Loans [Member]    
Loan Portfolio [Abstract]    
Total LHFI $ 500,507 $ 390,898
[1] During the first quarter of 2017, Trustmark reclassified $36.7 million of acquired loans not accounted for under FASB ASC Topic 310-30 to LHFI due to the discount on these loans being fully amortized.