Citigroup (C)

Big U.S. lenders are back in vogue with investors as the economy reopens, consumers spend, and the prospect of higher interest rates looms on the horizon. And, despite the recent bull run, many analysts forecast that the rally in bank stocks is likely to continue throughout this year. As banks continue to outperform the broader stock market, we take a look at four of the best bank stocks to bet on despite the sector's climbing valuations.