CANADA STOCKS-TSX flat shortly after open as banks offset materials

TORONTO, June 21 (Reuters) - Canada's main stock index was little changed on Wednesday, as bank stock declines offset gains in mining shares.

The Toronto Stock Exchange's S&P/TSX composite index was off 1.33 points, at 15,148.27, see-sawing between positive and negative territory in early trading.

Four of the index's 10 main groups were in positive territory.

(Reporting by Solarina Ho; Editing by Chizu Nomiyama)