Millennials and big banks have trust issues — here are three ways financial institutions are trying to fix that

For millennials, gone are the days of standing in line at the bank.

The generation that saw its parents' banks foreclose on homes and some big institutions go under in the Great Recession isn't ready to return to big banks. And according to several recent studies and surveys, it comes down to trust.

Those trust issues are causing big banks to spend billions to cater to the millennial generation, whether it's through coffee shops, smartphones or cold hard cash.