BMO says it will be increasing the $4 billion in lending it has already authorized for the province by up to 25 per cent.
Robert Hayes, the BMO executive in charge of Alberta, says the money will provide small and medium-sized businesses with more certainty as they rebuild.
He says bankers will make lending decisions locally.
BMO senior economist Robert Kavcic says despite the floods, Alberta's economic outlook is bright.
He says the province on pace to post above-average economic growth of 2.2 per cent this year and 3.3 per cent in 2014, as higher oil prices boost both the energy sector and provincial finances.
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