(Bloomberg) -- The gap between U.S. bank deposits and loans is growing at the fastest pace in two years, providing lenders with more funds to buy bonds and temper the biggest sell-off in Treasuries since 2010.

As deposits increased 3.3% to $8.88 trillion in the two months ended July 31, business lending rose 0.7% to $7.11 trillion, Federal Reserve data show. The record gap of $1.77 trillion has expanded 15% since May, the biggest similar-period gain since July, 2010. Banks have already bought $136.4 billion in Treasury and government agency debt this year, more than double the $62.6 billion in all of 2011, pushing their holdings to an all-time high of $1.84 trillion.

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