Question struggling a bit with animations

So, i'm trying to make a character jump when i press "space". But the problem is that when it ends it doesnt get back to the idle animation.

my code is like this:

if (Input.GetKeyDown(KeyCode.Space))

{

playerAnim.Play("IdleJump");

playerAnim.ResetTrigger("Idle");

}

I have tried to use these lines after this "if":

if (Input.GetKeyUp(KeyCode.Space))

{

playerAnim.SetTrigger("Idle");

}

But it just makes the animation stop when i release "Space". I know its an easy fix, but i just can't find how.