I accidentally put in banana bread 1 1/2 tsp of baking soda instead of 3/4 tsp of baking soda. Is it going to be edible?
Edible, yes. The best banana bread you've ever had? Probably not.
Over-leavened quick breads tend to just get uneven in texture - you may get an uneven loaf with one section that's a little too dense and other sections that are a little too airy, or the whole thing may end up coarse and a little flatter than you'd prefer. But these breads are often rich enough that they're still perfectly tasty.
There's a little risk of the extra baking soda introducing an off flavor, but in practice, I've found that most people won't notice it until you're WAY over-leavened. Taste buds vary but I don't think it'll be an issue for you.
It's been an hour since you've posted the question so I'm assuming that we will have the actual answer pretty shortly.