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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 611,280 $ 738,099
Acquired loans   71,786
Deposits 13,222,413 11,245,557
Federal funds purchased and securities sold under repurchase agreements 153,834 256,020
Other borrowings 178,599 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 564,638 358,916
Securities held to maturity 611,280 738,099
Deposits 13,222,413 11,245,557
Federal funds purchased and securities sold under repurchase agreements 153,834 256,020
Other borrowings 178,599 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 564,638 358,916
Securities held to maturity 639,665 746,202
Deposits 13,227,707 11,250,071
Federal funds purchased and securities sold under repurchase agreements 153,834 256,020
Other borrowings 178,600 85,374
Junior subordinated debt securities 45,773 50,722
Level 3 [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI and PPP loans 10,669,988 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 and PPP loans 10,680,458 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.