AMP a comfortable banker 24 August 2007 4:23PM John Kavanagh AMP was comfortable with its banking strategy, although the performance of the business needed some improvement, AMP chief executive Andrew Mohl said yesterday.The size of AMP's mortgage book increased from $7.2 billion at December to $7.8 billion at the end of June, a healthy annualized 16.6 per cent. But its deposit book fell from $1.8 to $1.6 billion over the same period.