JACKSON (AP) – Mississippi-based Trustmark Corp. has completed its purchase of Alabama-based Reliance Bank for $23.7 million in cash. Trustmark said Monday that it closed the deal for RB Bancorp of Athens, Alabama, on Friday. Reliance customers will convert to Trustmark computer systems on June 17. The move strengthens Trustmark’s position in Alabama by giving it offices in the Huntsville area for the first time.