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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Loan Portfolio Held for Investment (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Loan Portfolio [Abstract]    
Total LHFI [1] $ 8,004,657 $ 7,851,213
Less allowance for loan losses, LHFI 72,445 71,265
Net LHFI 7,932,212 7,779,948
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]    
Loan Portfolio [Abstract]    
Total LHFI 859,927 831,437
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]    
Loan Portfolio [Abstract]    
Total LHFI 1,656,837 1,660,043
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]    
Loan Portfolio [Abstract]    
Total LHFI 399,636 318,148
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]    
Loan Portfolio [Abstract]    
Total LHFI 2,064,352 2,034,176
Commercial and Industrial Loans [Member]    
Loan Portfolio [Abstract]    
Total LHFI 1,540,783 1,528,434
Consumer Loans [Member]    
Loan Portfolio [Abstract]    
Total LHFI 166,314 170,562
State and Other Political Subdivision Loans [Member]    
Loan Portfolio [Abstract]    
Total LHFI 910,493 917,515
Other Loans [Member]    
Loan Portfolio [Abstract]    
Total LHFI $ 406,315 $ 390,898
[1] During the first quarter of 2017, Trustmark reclassified $36.7 million of acquired loans not accounted for under Financial Accounting Standards Board (FASB) Accounting Standard Codification (ASC) Topic 310-30, “Loans and Debt Securities Acquired with Deteriorated Credit Quality” to LHFI due to the discount on these loans being fully amortized.