Trustmark National Bank's Interest Checking Account is for customers who want to earn interest on their checking account while having maximum availability. Account features include a minimum opening balance $1,000, pays interest on minimum balance of $1,000, no service charge on balance of $1,000 or more; $9.00 service charge if minimum balance falls below $1,000 during the month, 30 free deposit items per month ($.075 charge for each item deposited over 30 per statement period) and free Trustmark express ATM card or expresscheck debit card.