Terms of the deals were not disclosed by the team for Smith and Leuer, who agreed to play in the Motor City on the first day of NBA free agency. The Detroit News reported that Smith's contract was for three years and $18 million while Detroit Free Press detailed that Leuer's pact was for four years and $41 million.
"Ish is a player that will give us quality depth at the point guard position," said Stan Van Gundy, Pistons president of basketball operations and head coach. "He's efficient scoring the basketball, posted career-high numbers in assists per game a year ago and rebounds well for his size.
"Jon is a player that adds size and versatility to our roster. His outside shooting ability gives us offensive flexibility and his ability to guard the post will help from a defensive standpoint. We look forward to integrating both their talents into our system."
Smith recorded career highs in points (12.6), assists (6.5) and rebounds (4.0) while appearing in 77 games with Philadelphia and New Orleans last season. The 28-year-old posted a single-game personal best with 28 points versus Toronto on Jan. 9.
Leuer has already played for four teams in his five-year career, most recently the Phoenix Suns.
Leuer has career averages of 5.6 points and 3.5 rebounds in 253 games. The 27-year-old's best year came last season in Phoenix, when he posted career-high averages of 8.5 points and 5.6 rebounds.