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Cash and Due from Banks	12 Months Ended
Cash and Due from Banks	Dec. 31, 2017
Cash And Cash Equivalents [Abstract]
Cash and Due from Banks	Note 3 – Cash and Due from Banks Trustmark is required to maintain average reserve balances with the Federal Reserve Bank of Atlanta based on a percentage of deposits. The average amounts of those reserves for the years ended December 31, 2017 and 2016 were $100.8 million and $94.7 million, respectively.