Hey there! The reliability of financial institutions is best checked through the experience of the clients of this structure themselves. Here is a link to credit karma feedback where you will find feedback from many users. This will help you avoid misunderstandings. Cheers.
There are various types of financial institutions and they do have different services. Based on the various types of financial institutions, banks are responsible for collecting deposits of the customers as their savings or as investments in the case of investments banks. On the other hand, there are a number of financial services like insurances, mortgage services, loan lending etc (which are provided by other institutions). We can also say that there are many types of financial services and banks provide savings, depository and investment services while other services are offered by other institutions.