Actually, a certain amount of opposite aileron is required to maintain bank angle. Thus, the aileron on the outer wing will deflect up and "reduce" AoA on that wing.
The outer wing's higher AoA can instead be visualised if you take a board, put it across and walk up a spiraling staircase. The rail represent the relative airflow to the board's "chord line". You will se the angle between the rail and the board is greater along the outer rail than the inner.
Same can be said about a descending turn, do the same experiment and you'll see why in a descending turn the inner wing stalls first, flipping you into the turn.