HDFC Bank reported a net profit of Rs 15,976 crore for the September quarter, following its amalgamation with parent HDFC. The bank's consolidated net profit stood at Rs 16,811 crore, better than expectations. However, the bank's margins declined due to the additional funds raised for the merger and the different nature of HDFC Bank's business compared to HDFC. The bank's net interest margin dropped to 3.4% post-merger.