New figures released by the British Bankers' Association (BBA) have shown a £6.1 billion rise in personal deposits and savings in Britain's banks in the first six months of this year.
However, during the first half of 2010, the figures were up £15.9 billion.
There was a 3.5% increase in personal deposits last month, while unsecured credit was down 1.2% year-on-year.
Net mortgage lending by Britain's banks increased 1.8% year-on-year in June.
The growth figure is much ahead of the 0.7% registered for the whole mortgage market in the previous month, the BBA said.
David Dooks, statistics director at the BBA, said: "Banks continue to lend for house purchase but the weak mortgage market is self-evident, although some growth is coming from the buy-to-let sector to meet demand for rental properties.
"Personal deposits are growing only slowly as some people may be using savings to pay higher household bills.
"Businesses, as has been seen elsewhere, are concerned about the economic outlook and, in weathering difficult trading conditions, they are putting off expansion or investment plans and limiting borrowing."