Posted in Web Frost Bank Reviews and Ratings – Bankrate.com May 20, 2019 Frost Bank is a San Antonio, TX-based, FDIC-insured bank founded in 1899. Regulatory filings show the bank having equity of $3.27 billion on $31.80 billion in assets, as of December 31, 2017. : https://www.bankrate.com/banks/frost-bank/682563/