M And T Online Banking: Welcome to Online Banking |

M And T Online Banking Welcome to Online Banking | M&T BankUnauthorized access is prohibited. Usage may be monitored. Have questions about M&T Online Banking? Personal Accounts: 1-800-790 ... Log in to M&T Online Banking or Commercial Treasury ...Click here to log in to M&T Online Banking, M&T Online Banking for Business, or M&T Commercial.