TD Online banking?

A full bank account has the bank number, plus branch number, plus the account number. For TD, branch plus account adds up to 11 digits. The bank number is represented as 3 digits usually, so that would be 14 total. Unless you chop off a leading zero to get 13.

I don't think TD would log you in on your bank account number though. Online and telephone banking were set up so that you could add or delete accounts without changing how you accessed your accounts - the connect id or access card were used. They likely had a shorter access card number in the past.