Shares of IDBI Bank fell 2% on Tuesday after global ratings firm Standard & Poor's (S&P) downgraded the company's foreign currency issuer credit rating on the back of weak asset quality.

IDBI Bank shares opened lower and lost a further 2% to Rs 63.65 on the BSE. On the National Stock Exchange, the stock fell 2% to Rs 63.50.
The foreign currency issuer credit rating on IDBI Bank was cut to 'BB+/B' from 'BBB-/A-3'. The outlook on the long-term rating is negative, S&P had said.
'BB+' is considered the highest speculative grade, while 'BBB-' reflects adequate capacity to meet financial commitments, but more subject to adverse economic conditions.
"We downgraded IDBI because we expect the bank's asset quality to remain weak over the next 12-18 months," S&P credit analyst Amit Pandey said.