Heritage Bank re-entered the investor home loan market on Monday after a six week hiatus from interest-only lending.The Toowoomba-based bank stopped accepting applications from investment borrowers on 1 September to ensure it remained within volume growth caps set by the Australian Prudential Regulation Authority."After monitoring our approvals and the composition of our loan portfolio, we believe we are now in a position to comply with these regulatory requirements, however it will continue to be closely monitored," Heritage said in a memo to mortgage aggregators.The bank has retained a maximum loan-to-value ratio on all new investment lending at 80 per cent.