Yesterday, we posted our earnings press release, financial supplement, and investor presentation on the Investors section of selective.com. Our reserves remain stable across all insurance segments and lines of business, and our underlying profitability reinforces our confidence in achieving our full-year guidance. As we've emphasized in prior quarters, we continue to prioritize underwriting margins over top-line growth. Despite ongoing industry-wide reserve pressure in this segment, market pricing, particularly in other liability occurrence, has not adjusted upward.
In Standard Personal Lines, premiums declined 6%, while our target mass affluent market business grew by 1%. Our relative exposure to contractors has declined within our new business mix, reflecting our efforts to diversify and improve margin durability. We continue to invest in capabilities that support scale, diversification, and profitable growth. While we have deployed many AI tools and are evaluating more, I would like to highlight two that are having a meaningful impact in driving better, more consistent outcomes, while also improving productivity.
We also have deployed automation to support evaluation of contractual risk transfer adequacy, a key element of the underwriting process for contractors. For the quarter, we reported fully diluted EPS of $1.58 and non-GAAP operating EPS of $1.69, resulting in an 11.2% ROE and a 12% operating ROE. Importantly, we had no prior year casualty reserve development at the segment or line of business level. As a reminder, the first quarter typically runs a higher combined due to normal seasonality, and we expect our full-year underlying combined ratio to fall within our original 90.5%-91.5% range.