A controversial decision by First National Bank of Chicago to charge some customers $3 per transaction for using tellers has already caused some backpedaling by the bank and has raised a bit of tension with First Chicago Corp.'s merger partner, NBD Bancorp.

Early last month, First Chicago's lead subsidiary quietly sent notices to customers saying the bank had decided to cut in half the amount needed in a savings account to get unlimited free teller visits, from $5,000 to $2,500.

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