Charlie Munger, vice chairman of Berkshire Hathaway, and chairman Warren Buffett haven't shied away from bank stocks over time. In fact, today Bank of America (NYSE: BAC) is their biggest holding in terms of number of shares held -- and the second biggest by market value.

Still, Munger has concerns right now about the U.S. banking sector. He says there might be trouble ahead -- and it's linked to the commercial property market. But before you go out and sell your financial shares, let's take a closer look at what the billionaire investor said in an interview with The Financial Times.

First, a quick note about what's going on in the property market. In the first quarter, prices of U.S. commercial properties dropped for the first time in more than a decade. That's according to Moody's Analytics.

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Source Fool.com