Small banks "are a constraint" on ANZ and other big banks at time when the rate of deceleration in credit growth is stepping up."We're going for the right share of the home loans and home loan growth," Shayne Elliott, CEO, told a briefing yesterday for its half-year profit."Owner-occupier is a better position to be in. It's where we can find the most people to help as an end to end service and we like that," he said.The mix of ANZ's new business flows were 69 per cent for owner occupiers and 29 per cent for investment loans over the latest half, compared with 62 per cent and 34 per cent a year ago.Elliott conceded that "margins are lower in that business, we like that."Credit growth "is probably still falling", Elliott said.ANZ, Elliott said, would apply "a level of caution that will make it a bit harder to get credit."More history, more documents, more bank statements and more proof of expenses that will, I imagine, slow down people's ability to get a loan. You've got to be prepared and more robust [as a borrower] to make sure you've got everything."Philip Lowe, governor of the Reserve Bank of Australia echoed this sentiment in remarks at a dinner in Adelaide last night."It is possible that lending standards in Australia will be tightened further in the context of the current high level of public scrutiny," Lowe said.ANZ disclosed that interest only loans comprised 14 per cent of its lending flow over the six months to March 2018, down from 27 per cent six months ago and 42 per cent one year ago.The bank said A$23 billion in IO loans converted to principal and interest over the last 12 months, with a further $22 billion contracted to do so in the year ahead.