Net loss came in at Rs 198 crore in the three months ended Septmber 30, compared with a profit of Rs 55.52 crore a year earlier, the Mumbai-based bank said.
Gross bad loans as a percentage of total loans was 24.98 per cent at end-September, compared with 24.11 per cent a quarter earlier, and 13.05 per cent a year earlier.
IDBI shares were trading 4.3 per cent lower in the Mumbai market that was down 0.29 per cent.