Regional U.S. banks Huntington Bancshares and TCF Financial have agreed to merge in an all-stock transaction. Huntington will acquire TCF for almost $6.00 billion. The combined bank will have about $170 billion in assets and over 1,200 branch locations in 12 states. When their debit card businesses are combined, the new bank will rank 14th largest in the U.S. Huntington and TCF combined generated $39.05 billion in purchase volume in 2019 from 1.06 billion transactions and 5.1 million cards. Huntington, which issues Mastercard brand debit cards, uses Fiserv to handle cardholder account proce...