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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 538,072 $ 738,099
Net acquired loans   71,786
Deposits 14,048,764 11,245,557
Federal funds purchased and securities sold under repurchase agreements 164,519 256,020
Other borrowings 168,252 85,396
Subordinated notes 122,921  
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 1,952,554 358,916
Securities held to maturity 538,072 738,099
Deposits 14,048,764 11,245,557
Federal funds purchased and securities sold under repurchase agreements 164,519 256,020
Other borrowings 168,252 85,396
Subordinated notes 122,921 0
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 1,952,554 358,916
Securities held to maturity 563,115 746,202
Deposits 14,052,863 11,250,071
Federal funds purchased and securities sold under repurchase agreements 164,519 256,020
Other borrowings 168,252 85,374
Subordinated notes 127,500 0
Junior subordinated debt securities 46,083 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 10,317,352 9,251,351
Net 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 10,312,395 9,235,674
Net 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 5 – Acquired Loans for additional details.