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Acquired Loans - Additional Information (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items]          
Acquired loans   $ 72,601      
Allowance for loan losses, acquired loans   $ 815 [1] $ 1,249 $ 1,398 $ 1,231
ASU 2016-13 [Member] | Purchased Credit Deteriorated (PCD) Loans [Member]          
Financing Receivable Allowance For Credit Losses [Line Items]          
Acquired loans $ 72,600        
Allowance for loan losses, acquired loans $ 815        
[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.