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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 704,276 $ 738,099
Net LHFI 9,467,356 9,251,351
Acquired loans   71,786
Deposits 11,575,764 11,245,557
Federal funds purchased and securities sold under repurchase agreements 421,821 256,020
Other borrowings 84,230 85,396
Junior subordinated debt securities 61,856 61,856
Level 2 [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments 406,341 358,916
Securities held to maturity 704,276 738,099
Deposits 11,575,764 11,245,557
Federal funds purchased and securities sold under repurchase agreements 421,821 256,020
Other borrowings 84,230 85,396
Junior subordinated debt securities 61,856 61,856
Level 2 [Member] | Estimate Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments 406,341 358,916
Securities held to maturity 731,441 746,202
Deposits 11,584,178 11,250,071
Federal funds purchased and securities sold under repurchase agreements 421,821 256,020
Other borrowings 84,227 85,374
Junior subordinated debt securities 46,392 50,722
Level 3 [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI 9,467,356 9,251,351
Acquired loans [1] 0 71,786
Level 3 [Member] | Estimate Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI 9,465,548 9,235,674
Acquired loans [1] $ 0 $ 71,786
[1] Upon adoption of FASB ASC Topic 326 at January 1, 2020, Trustmark elected to account for its existing acquired loans as purchased credit deteriorated loans included within the LHFI portfolio.  See Note 4 – Acquired Loans for additional details.