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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 660,048 $ 738,099
Net LHFI and PPP loans 9,540,618 9,251,351
Acquired loans   71,786
Deposits 13,505,473 11,245,557
Federal funds purchased and securities sold under repurchase agreements 70,255 256,020
Other borrowings 152,860 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 1,026,640 358,916
Securities held to maturity 660,048 738,099
Deposits 13,505,473 11,245,557
Federal funds purchased and securities sold under repurchase agreements 70,255 256,020
Other borrowings 152,860 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 1,026,640 358,916
Securities held to maturity 690,561 746,202
Deposits 13,512,248 11,250,071
Federal funds purchased and securities sold under repurchase agreements 70,255 256,020
Other borrowings 152,861 85,374
Junior subordinated debt securities 45,155 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 10,480,401 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 10,500,218 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.