The country's 12 largest retail banks have increased their median overdraft fees over the last year, and most still don't offer consumers a clear overview of the costs, according to a report issued by the Pew Charitabler Trusts on Thursday.

The non-profit group said four of the top 12 banks including BB&T Corp. (BBT), HSBC Finance Corp., (HTB), Regions Financial (RF), and Capital One Financial Corp. (COF) did not disclose the size of overdraft penalty fees in writing either on checking account home pages or on the Web pages describing specific accounts.

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