Welcome to Android Central! Which bank app are you using? It's more likely to be an app problem, not a camera problem. Make sure the bank app is up to date.
When taking a picture of the check, are the images clear, but it keeps telling you to retake them? Or is it coming out blurry?
Also, make sure you have enough free space around the edges of the check. The Bank of America app gets finicky if the image is too close up.