The rating actions reflect the significant deterioration in IDBI's financial profile, driven by asset quality issues and the heightened risk to its solvency position, the ratings agency said in a statement.
Thelocal and foreign currency bank deposit ratings has been downgraded to'Ba2/Not Prime' from 'Baa3/Prime-3', Moody's said, adding theratings are under review for further downgrade.
Separately, IDBI Bank said the government, which has infused Rs 1,900 crore in the lender this year, continues to support it.
The bank added it plans to raise capital through sale of non-core assets and churning of corporate loan book.
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At the end of March 2017,IDBI's impaired loans (non- performing loans plus standard restructured loans) ratio rose to 29 per cent versus 19 per cent a year earlier.
In addition, loanloss reserves, when adjusted for the restructured loans, stood at about34 per cent at the end of March 2017 -- which was one of the weakest among Moody's-rated public sector banks in India, the US-based agency said.
It added that the bank's buffers against further asset qualitystress remain weak.
"Moody's expects the bank to remain dependent on capital infusionsfrom the government to meet the minimum capital standards," it said.
Itsaid thatgiven the current fragile financial strength of many publicsector banks, including IDBI, "any reduction in government support willresult in lower levels of confidence in such banks, and could negativelyaffect systemic stability".
IDBI to focus on augmenting capital base, NPA recovery
IDBI Bank in a separate statement said it has crafted a comprehensive turnaround strategy with a focus on augmenting the capital base and recovery from NPAs.
The government has already infused Rs 1,900 crore in the bank this year and LIC has also subscribed to its preferential issue.
IDBI Bank MD and CEO Mahesh Kumar Jain said the government continues to support the bank.
"We will look at aggressive recovery and cost cutting measures and plan on churning our corporate book and risk weighted assets which should also ease the pressure on capital," he said.
Headquartered in Mumbai, IDBI Bank Ltd held assets totalling Rs 3.62 lakh crore at end-March 2017.