Competing banks will pounce if ANZ puts the Black Horse and the National Bank out to pasture, sources say.
ANZ yesterday announced it would phase out the National Bank brand over the next two years.
Even before the official announcement banks approached yesterday were preparing for the shake-up and a change that would "have a significant impact on the dynamics of the banking market", said a senior banking source.
National Bank customers might consider moving banks, although an end to the dual brand strategy did need to be phased in, the source said.
David Tripe, Massey University's director for the centre for financial services and markets, said competing banks like BNZ and Kiwibank would be quick to capitalise on the disruption to the market.