From what i have read and heard, I don't think it was SPECIFICALLY Antisemitism. I think it was just anti-ANYBODY and EVERYBODY else! The horrible atrocities exercised against the Jewish people got the most publicity because it claimed the most unfortunate, innocent victims.
There were other victims, too. The eastern European Gypsies, for instance, were targets of Nazi genocide just like the Jews.
That said, however,, it HAS occurred to me to wonder if part of their anti-Jewish campaign might have been due to the large Jewish presence in the banking systems of Europe at that time.
The oppressive, early, version of the Catholic church that ruled during the "dark ages" (yeah, those same guys who brought us the Spanish Inquisition) didn't like competition from other religions, so they placed insane restrictions on their practitioners. Using as a lame excuse, the ridiculous argument that the Jews were responsible for the crucifixion of Jesus, the ruling church imposed all sorts of impossible conditions on their lives. Jews were forbidden to own property or even work for a Christian employer in some parts of Europe. In a socio/political climate where it was alkmost impossible for them to survive, since they could not own PROPERTY, about all they COULD own was MONEY, itself. Over the centuries, this situation evolved into them gravitating toward the professions of money-lending, and then banking.
So the Nazis' campaign against them could well have originated with the classic hatred of the rich by the poor, and the desire to seize the money and power some of these people had - and THEN it escalated to a more generalized racial hatred. So, to cover the original motivation of greed, disguise and sell the idea as wholesale antisemitism, they set out to destroy ALL Jews, rich OR poor.
Some of this is fact, and some is my own theorizing, but in light of what we know DID happen, it makes sense.